Bluetooth Protocol : Bluetooth Specification V3.0 SPP+V4.2 BLE Operating frequency: 2.4GHz ISM band Communication interface: UART Power supply : MIN:1.8V-MAX:3.6V(3.3V is recommended) Communication distance: 30-40M (open environment) Size:27mm x13mm x2 mm Bluetooth certification: ROHS REACH FCC Bluetooth name: BT04-A (customizable) Pairing code: 1356 (valid for SPP protocol) Serial port parameters: 9600, 8 data bits, 1 stop bit, no parity, no flow control Service UUID:FFE0 Notify\Write UUID: FFE1 Write UUID: FFE2 Storage temperature: MIN:-40℃-MAX:+125℃ Work temperature: MIN:-20℃-MAX:+85℃