Know when police gear is near — anywhere in New Hampshire.
From Manchester (pop. 110,229) across all 50 of its biggest cities, New Hampshire law-enforcement gear broadcasts Bluetooth and Wi-Fi signatures everywhere it goes. Cop Spotter listens for them — green means clear, red-and-blue means near.
Built in small batches. No subscription. No account.
Coverage across the state.
Pick your city for local coverage.
Hillsborough County · pop. 110,229
Hillsborough County · pop. 87,970
Merrimack County · pop. 43,976
Merrimack County · pop. 42,605
Rockingham County · pop. 34,539
Strafford County · pop. 30,880
Strafford County · pop. 30,038
Rockingham County · pop. 29,549
Hillsborough County · pop. 26,726
Cheshire County · pop. 23,265
Rockingham County · pop. 22,015
Rockingham County · pop. 21,530
Hillsborough County · pop. 21,188
Belknap County · pop. 16,227
Grafton County · pop. 13,579
Rockingham County · pop. 13,091
Sullivan County · pop. 12,984
Hillsborough County · pop. 12,676
Strafford County · pop. 11,759
Rockingham County · pop. 11,037
Strafford County · pop. 10,345
Rockingham County · pop. 9,656
Coos County · pop. 9,367
Rockingham County · pop. 9,242
Hillsborough County · pop. 8,835
Rockingham County · pop. 8,679
Rockingham County · pop. 8,650
Grafton County · pop. 8,636
Hillsborough County · pop. 8,583
Merrimack County · pop. 8,450
Strafford County · pop. 8,417
Merrimack County · pop. 8,381
Hillsborough County · pop. 8,307
Rockingham County · pop. 7,885
Belknap County · pop. 7,849
Hillsborough County · pop. 7,711
Merrimack County · pop. 7,461
Hillsborough County · pop. 7,336
Cheshire County · pop. 7,224
Rockingham County · pop. 6,949
Rockingham County · pop. 6,782
Rockingham County · pop. 6,225
Cheshire County · pop. 6,049
Rockingham County · pop. 5,827
Merrimack County · pop. 5,676
Merrimack County · pop. 5,418
Merrimack County · pop. 5,379
Rockingham County · pop. 5,297
Hillsborough County · pop. 5,283
Rockingham County · pop. 5,277
The signature database is built from public registries — Bluetooth SIG company IDs, IEEE hardware prefixes, and the known broadcast fingerprints of the gear itself.
Axon body cameras announce themselves over Bluetooth so docks can find them — including a hardware signature that survives the address rotation newer cameras use to hide. If a bodycam is close, Cop Spotter knows.
Tasers and Axon vehicle gear broadcast their own Bluetooth identities. Same family, same tell — the spotter matches them against the verified Axon signature set.
Flock safety-camera accessories — extended batteries, setup hotspots — leak recognizable Bluetooth names and Wi-Fi hardware prefixes. Cop Spotter watches both radios.
Modern police radios carry Bluetooth for mics and earpieces, and their hardware shows up in the air with manufacturer fingerprints. A radio match strobes the light exactly like every other gear type — nothing is second-class.
AirTags, SmartTags, Tiles and other tracking tags call home over Bluetooth. Cop Spotter listens for them too — when one is close enough to be traveling with you, the light pulses purple, and the pulse quickens as you get closer, so you can walk it down.
Skimmers hidden inside pumps and card readers phone home through cheap Bluetooth serial modules — and those modules advertise. When one is close, the light blinks amber before your card goes in.
Also in the database: Utility BodyWorn bodycams, Axon Fleet in-car systems, WatchGuard & Digital Ally in-car video, police drones (DJI and anything flying Remote ID), Stryker LIFEPAK ambulance monitors, Cradlepoint patrol-car routers, and Geotab fleet telematics — 103 verified hardware fingerprints in all.
No screen to read. One light tells you everything.
The board continuously scans Bluetooth and Wi-Fi broadcasts — the public advertisements devices send out so other equipment can discover them.
Every broadcast is checked against the signature database: company IDs, service UUIDs, hardware prefixes, and device names known to belong to police equipment, tracking tags, and skimmer hardware.
When a signature matches, the light answers in color — every gear type counts, radios included. Cooldowns between alerts keep the light meaningful instead of constant.
No modes, no menus — Cop Spotter listens for everything at once, and the color names what it heard.
Purple and amber only fire at close range — close enough to be on you or your car — so a crowd full of other people’s trackers doesn’t cry wolf.
Asked by buyers across New Hampshire.
Yes — it needs no network, app, or account. The signatures it matches are the same in Manchester as in the smallest town in New Hampshire.
$50 one time — shipping included (U.S.), no tax added, no subscription, ever.
The 50 biggest cities in New Hampshire — listed below. The detector itself works anywhere in the state, page or no page.
Bodycams, Tasers, Flock camera accessories, radio gear, in-car video systems, police drones, LIFEPAK monitors, patrol-car routers, fleet telematics, hidden trackers, and skimmer modules — 103 verified hardware fingerprints.
Small batches, built to order.
The detector board, with the detection firmware loaded and the signature database installed. You add any USB-C power source — a power bank makes it pocket carry.
Buy now — $50Secure checkout via Stripe — shipping included, address collected at checkout (U.S.). Questions first? [email protected]
The same detector on your Android phone — all 103 signatures. It listens only, holds no internet permission, and collects nothing. Free, no account; the APK installs direct.
If it earns its keep, chip in: support goes straight into the next batch of boards.
Receive-only, by design. Cop Spotter listens to public broadcast advertisements that devices intentionally transmit for discovery. It does not intercept, decrypt, record, or interfere with any communication, and it transmits nothing.
Know your local laws. Rules around detection equipment vary by place. What the device does is legal in most of the U.S., but the responsibility for where and how you use it is yours.
No guarantees. Detection depends on the target gear being powered and advertising. This is an awareness tool, not a safety device.