UNA Watch — BLE Services Overview

This is the map of the GATT services a UNA Watch exposes over Bluetooth Low Energy. Most are standard Bluetooth SIG or vendor services — any BLE tool recognizes them. The File Transfer Service has its own reference: BLE-File-Transfer-Service.md.

Security. The watch requires a bonded, encrypted connection. Pair with the watch before reading or writing any characteristic.

Services

The standard Bluetooth SIG and Nordic services follow their published specifications — refer to those documents for field formats. The File Transfer Service is UNA’s (Adafruit-based); see its own reference.

Service	UUID	Source	Purpose
Device Information	0x180A	Bluetooth SIG	Manufacturer, model, serial, firmware/hardware revisions
Current Time	0x1805	Bluetooth SIG	Time sync from the phone
Battery	0x180F	Bluetooth SIG	Battery level
File Transfer	0xFEBB	Adafruit	File read/write, OTA — see its own reference
Nordic UART	6E400001-B5A3-F393-E0A9-E50E24DCCA9E	Nordic	Serial-style data channel

Device Information (0x180A)

Characteristic	UUID
Manufacturer Name	0x2A29
Model Number	0x2A24
Serial Number	0x2A25
Firmware Revision	0x2A26
Hardware Revision	0x2A27

Reading 0x2A26 is the supported way to discover the watch’s firmware version.

Current Time (0x1805)

Characteristic	UUID
Current Time	0x2A2B
Local Time Information	0x2A0F

Battery (0x180F)

Characteristic	UUID
Battery Level	0x2A19

Standard uint8 percentage; subscribe for notifications on level change.

Nordic UART (6E400001-B5A3-F393-E0A9-E50E24DCCA9E)

A Nordic UART Service (serial-style channel). Note the two data characteristics are swapped relative to Nordic’s usual convention:

Characteristic	UUID	Direction
Watch → client	6E400002-B5A3-F393-E0A9-E50E24DCCA9E	Notify
Client → watch	6E400003-B5A3-F393-E0A9-E50E24DCCA9E	Write / Write Without Response

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Bluetooth SIG service/characteristic formats are defined by the Bluetooth SIG; the File Transfer Service is based on the Adafruit protocol (see its reference).