A&D UB-1100BLE Instruction Manual page 13

Using the Monitor
Charging the Device
Battery may be partially charged but be sure to charge the device completely upon first use after purchase.
1. Remove the USB connector cover.
2. Connect the charging cable.
3. During charging, the red LED will illuminate.
4. When charging is complete, the red LED will turn off.
5. Once charging is complete, remove the charging cable.
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