ACR ResQLink 400 (Model 2921 / PLB-400)

Published · Researched 2026-09-21

2026 lineup note: Current and still sold new, but it is no longer the top of ACR's line. Newer options: ResQLink 410 RLS (adds Return Link Service — confirmation your distress was received) and the ResQLink View (PLB-425, model 2922) with a digital display and 28 h operating time, plus the View RLS. The 400 remains the cheapest subscription-free entry into the ResQLink family.

Version lineage (2023–2026)

• Pre-2023 — ResQLink+ (PLB-375): predecessor; 24 h battery, no Galileo, larger form factor.
• ~2019 — ResQLink 400 (PLB-400, model 2921): slimmer design, GPS + Galileo GNSS, multifunction clip, still 24+ h and 5-year battery.
• 2023–2026: 400 continues unchanged. ACR expands the family upward: ResQLink 410 RLS (adds RLS acknowledgment via Galileo; US list $450) and ResQLink View (PLB-425) (digital status display, 28 h operation, $549.95 list). Note: "425" is the View's model number, not a successor to the 400 — don't confuse them.
• 2026: 400 still widely stocked at US retailers; street price essentially equals list ($404.95).
• Smart buy: yes, a newer 410 RLS exists and is worth the ~$45 premium if you value confirmation that your SOS was received. The 400 is otherwise the same rescue system — same 406 MHz/Cospas-Sarsat path, same 5-year battery. Buy the 400 to minimize cost; the 410 RLS for peace of mind. No subscription is required for any of them.

Overview

A subscription-free personal locator beacon (PLB): when activated, it transmits a 406 MHz distress signal with your GPS position to the international Cospas-Sarsat satellite system, plus a 121.5 MHz homing signal that lets rescuers pinpoint you up close. No plans, no apps, no messaging — a single-purpose "rescue me" button with a sealed 5-year battery. Registration with your national authority (NOAA in the US) is required. Best for: solo hikers, hunters, paddlers, and pilots who want the strongest possible distress signal with zero recurring cost.

Key Specs

Pricing

• MSRP / list: $404.95 — Amazon US comparison-table price (crawled 2026-02) and Riva Racing product page (crawled 2026-09-19). One outlier listing (mmarineonline, $524.95, page created 2026-03-22) appears to be regional/pricing drift rather than list — treat $404.95 as the working US reference.
• Street: $404.95 — Riva Racing (2026-09-19), in line with list; Amazon US matches. The 400 rarely discounts.
• Ongoing costs: none (no subscription). Battery replacement at ~5 years is factory service only — ACR charges for this; exact current US cost and turnaround UNVERIFIED in this pass (retailers historically cite ~$150+; confirm with ACR service before budgeting).
• Observation date: 2026-09-20. Prices from retailer crawls, not live checkouts — re-verify before buying.

In the Box

• ResQLink 400 beacon, multifunction clip system, documentation/registration instructions.
• Not included / needed: nothing — no subscription, no phone, no app. Registration is free.

Warranty

5 years — per retailer spec table (mmarineonline, crawled 2026-09-20).

Support & Parts

ACR Electronics (Fort Lauderdale, FL) is the US PLB incumbent; support covers registration help, self-test interpretation, and factory battery service. Battery replacement must go to ACR or an authorized service center (do not open the unit — doing so voids certification). No user-serviceable parts; accessories limited to clips/pouches.

Community Verdict

The PLB-vs.-satellite-messenger debate is the most argued topic in backcountry safety, and 2026 forums (rokslide, scubaboard, advrider) land in the same place: a PLB is the strongest pure distress signal — 5 W on 406 MHz through the government Cospas-Sarsat system vs. ~1.6 W on a commercial messenger, plus 121.5 MHz homing that aircraft and ground teams can track, with no subscription to lapse. A messenger is the better communication tool — two-way messaging lets you describe the emergency, summon non-emergency help, and cancel false alarms. Experienced users increasingly carry both: the PLB as the always-ready last resort, the messenger for everything else. A recurring warning: register your beacon (unregistered beacons slow rescues), and know that the 400 gives you no acknowledgment your signal was heard — that gap is exactly what the 410 RLS (with Return Link Service) was built to close.

Long-term durability & warranty-claim reality

• Battery replacement is the whole ownership story. The sealed 5-year cell can't be user-swapped without voiding certification. Authorized-service pricing (Sept 2026): ~$150 (rokslide owner report) to $192 (Life Raft Store, 3-day turnaround, in-person Melbourne FL available). ACR's own factory price remains UNVERIFIED — call around, as forum users advise; prices differ by service center.
• Free replacement after genuine use. Multiple owner sources (bestadvisor, rokslide) confirm: if you activate the beacon in a real emergency, ACR replaces the unit free. That's the warranty that actually matters on a PLB.
• Antenna pops out of its holder. catskillmountaineer's long-term review: the antenna "has a tendency to pop out of its holder if it is touched or bumped" — most owners buy a fabric case; ACR sells an optional one. Check the antenna is seated before every trip.
• Button confusion. The activation and test buttons sit side by side and look near-identical; catskillmountaineer wanted explicit "ACTIVATE"/"TEST" labeling. Learn which is which before an emergency.
• DIY battery swaps void certification. YouTube/forum guides show $13–$40 DIY swaps, but ACR "makes a big stink" about them (catskillmountaineer) — a self-serviced beacon's 406 MHz certification is compromised, which defeats the point of a certified rescue device.
• 5-year warranty (retailer spec tables, mmarineonline 2026-09-20); 5-year battery. Owners report the units themselves are near-indestructible — buoyant, 5 m waterproof, strobe-equipped — with essentially no electronics to fail.

Version history — year by year

• ~2019: ResQLink 400 (PLB-400, model 2921) — slimmer body, GPS + Galileo, multifunction clip; replaces the ResQLink+ (PLB-375).
• 2020–2022: unchanged; the 400 establishes itself as the default subscription-free PLB.
• 2023: ACR expands upward — ResQLink 410 RLS (model 2931, Return Link Service acknowledgment via Galileo) and ResQLink View (PLB-425) (digital display, 28 h operation). The 400 stays the budget entry.
• 2024–2025: 400 unchanged; street holds at $404.95.
• 2026: 400 still widely stocked; 410 RLS streets at ~$464.95 (list $514.95 per retailer "original price" — note: the $450 list figure in earlier notes appears stale; Sept 2026 retailer pages show $514.95). View/425 at $549.95 list. No 400 refresh.

Head-to-head vs closest rivals

• vs. ACR ResQLink 410 RLS (~$464.95 street, new in this catalog round): identical rescue path (406 MHz / Cospas-Sarsat, 5 W, 121.5 MHz homing, 24+ h, 5-yr battery, 5.22 oz) plus Galileo Return Link Service — a flashing blue light confirming your distress was received and located. ~$60 more for the single most-requested PLB feature. If you can afford it, buy the 410.
• vs. Garmin inReach Mini 2 ($349.99, sibling gadgets track): the messenger is lighter (3.5 oz), two-way, and cheaper up front — but needs a subscription forever and transmits at ~1.6 W on a commercial network. The PLB is the stronger distress signal with zero recurring cost; the Mini 2 is the better communication tool. Experienced users increasingly carry both.
• vs. Garmin inReach Messenger ($299.99, new in this catalog round): same PLB-vs-messenger logic at a lower messenger price point. Messenger for texting + SOS with a plan; ResQLink 400 for a one-time $405 "rescue me" button with no plan to lapse.

Care & maintenance

• Self-test sparingly — every full test draws the sealed battery; rokslide owners note you "can't test it without draining the battery." Annual test per the manual is plenty.
• Keep the antenna seated in its holder; store the unit dry with the multifunction clip attached.
• Renew your NOAA beacon registration every 2 years (free, beaconregistration.noaa.gov) — unregistered beacons slow rescues.
• Note the battery replacement date printed on the back; budget the ~$150–192 service at year 5.
• After any emergency activation, send the unit in — ACR replaces it free.

Buying traps

• Model-number soup: 400 = base PLB; 410 RLS = base + acknowledgment; 425 = View with display (not a "newer 400"). Sellers and buyers confuse these constantly — match the model number to the feature you want.
• Near-expiry batteries sold as new: bestadvisor owner complaint — "the unit I received was 4 years old" on a 5-year battery. Check the replacement date on the back on arrival.
• Used PLBs: factor the battery date and a $150–192 service into the price; confirm the previous owner released the NOAA registration so you can register it in your name.
• Gray-market / wrong-country units: beacons are country-coded; reprogramming costs extra (~$85+ at service centers, per Life Raft Store's PLB-375-era pricing). Buy a US-coded unit from a US seller.

Community Verdict — more voices (appended 2026-09-20)

• catskillmountaineer (long-term review): "We consider this device the best option to save your life in case you get lost or hurt" — docked from 5 stars to 4 for the identical-looking buttons, the popping antenna, and ACR's hostility to DIY battery service ($150 for what owners call "4 screws and unplug battery").
• rokslide battery-replacement thread: owners debate $150 service vs. buying new; the pragmatic consensus — "I sent mine in and had battery replaced last year. Cost about $150. Cheaper than a new one" — with the advice to call around since authorized prices differ. One owner upgraded to the View specifically to see battery level without draining it on tests.
• 2026 forums (rokslide, scubaboard, advrider): the PLB-vs-messenger debate lands consistently — PLB for the strongest distress signal (5 W, Cospas-Sarsat, 121.5 MHz homing, no subscription to lapse), messenger for two-way communication and false-alarm cancellation. The "carry both" camp keeps growing.

Images

• images/acr-resqlink-400-1.jpg — front studio shot in clip case (overtons.com, 800×800)
• images/acr-resqlink-400-2.jpg — front studio shot, full unit (macpac.com.au, 1060×1590)
• images/acr-resqlink-400-3.jpg — 3/4 angle with strobe lit (marinesuperstore.com, 1000×1000)
• Sources: https://www.overtons.com/acr-resqlink-400-personal-locator-beacon-without-display-357751.html · https://www.macpac.com.au/acr-resqlink-400-personal-locator-beacon-gps/119632.html · https://www.marinesuperstore.com/safety-beacons/plb-ais/acr-resqlink-400-plb

Research date: 2026-09-20. UNVERIFIED: ACR factory-direct battery-service cost (authorized-center pricing ~$150–192 documented Sept 2026); manufacturer MSRP label not separately confirmed beyond retailer list prices.

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Sources

• www.overtons.com — retrieval date not recorded
• www.macpac.com.au — retrieval date not recorded
• www.marinesuperstore.com — retrieval date not recorded