Every Flock device with an external battery uses Bluetooth to communicate health and safety data back to the camera. The Bluetooth radios use predictable naming schemes.
Penguin-NNNNNNNNNN (N = decimal digit)
FS Ext Battery
UPDATE 2025-03-19:
The Penguin battery firmware has been updated to remove "Penguin-" from the Bluetooth name, which is now simply:
NNNNNNNNNN (N = decimal digit)
To validate a specific device is a Penguin battery, look for a BTLE advertising packet with a Manufacturer Specific advertising data for XUNTONG (0x09C

, the data will include a serial number e.g. TN72023022000771
Packet Header: 0x2444 (PDU Type: SCAN_RSP, TxAdd: Random)
.... 0100 = PDU Type: 0x4 SCAN_RSP
...0 .... = Reserved: 0
..0. .... = Reserved: 0
.1.. .... = Tx Address: Random
0... .... = Reserved: 0
Length: 36
Advertising Address: d8:a0:d8:9f:4a:5e (d8:a0:d8:9f:4a:5e)
Scan Response Data: 1dffc809d8a0d89f4a5e2030502a544e3732303233303232303030373731
Advertising Data
Manufacturer Specific Length: 29
Type: Manufacturer Specific (0xff)
Company ID: XUNTONG (0x09c

Data: d8a0d89f4a5e2030502a544e3732303233303232303030373731
Using these patterns to search the
WiGLE.Net data nets many more hits, 18,000+ in fact.
Some cameras have multiple external batteries. Some (very few) cameras are hardwired and have no external batteries. WiGLE.Net relies on citizen reported data, so not all cameras will be identified in this dataset.
Mapping this data shows us what is potentially the real extent of Flock device deployments across the country, that line up a lot better with we know about Flock customers from the Transparency Portals.