Specifications
Weight5.4 oz / 153g
NetworkCOSPAS-SARSAT (government SAR network)
Battery Life5-year shelf life, 24+ hours transmitting
Water Rating15m / 50ft waterproof, floats
GPSGPS-enhanced position within 100m
RegistrationFree with NOAA (required)
SubscriptionNone
CertificationFCC, COSPAS-SARSAT approved
What Sets It Apart
The self-test function works as described, and NOAA registration is straightforward via the ACR website before deployment. The lack of two-way messaging is the key limitation — there is no way to send a status update to contacts while waiting for rescue.
No subscription, no monthly fee, 5-year battery — the SOS device that works when everything else fails
Who This Is For
The ACR ResQLink 400 is right for: hikers who reject subscription models on principle, anyone who wants a no-cost backup device alongside their primary communicator, sailors and pilots (for whom PLBs are the standard), and hikers doing very remote trips who prioritize reliable SOS over messaging.
A note on pricing and links: Prices are current as of May 2026. Some links are affiliate links.
How It Compares
Common Questions
What is a PLB vs satellite communicator?
A PLB (Personal Locator Beacon) only transmits an SOS with GPS coordinates to search and rescue via the COSPAS-SARSAT network. A satellite communicator (Garmin inReach, Zoleo) allows two-way messaging, live tracking, and SOS. PLBs require no subscription and are more reliable for emergency-only use. Communicators provide ongoing communication but require subscriptions.
Does the ACR ResQLink need a subscription?
No. The ResQLink 400 requires a one-time free registration with NOAA and has no ongoing costs. The 5-year battery service ($80) is required by regulation for the PLB to remain certified. Beyond that, no fees.
How long does the ACR ResQLink 400 transmit?
The ResQLink 400 transmits for a minimum of 24 hours once activated. The GPS-enhanced signal updates your position every 20-30 minutes so rescue teams can track your movement. Battery is rated for 5-year shelf life with 24+ hours active transmit capacity.
How do I register the ACR ResQLink 400?
Register for free at the NOAA Beacon Registration Database (beaconregistration.noaa.gov). You provide contact information and emergency contacts. Registration is legally required for US use and ensures rescue services can identify you and contact your family. The registration links your device serial number to your identity.
