Item Type: Serial Port Module_x000D_ Material: Plastic_x000D_ Operating Standard: BT SIG v2.1+EDR_x000D_ BT Protocol: BT SPP_x000D_ Interface Interface: RS232_x000D_ Communication Rate: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600, 1382400bps_x000D_ Modulation Method: 2.4G ISM Direct Sequence Frequency Hopping (FHSS)_x000D_ Communication Distance: 15 Meters in Open Space, Class 2 Level_x000D_ Transmit Power: 4 dBm_x000D_ Receiving Sensitivity: -79dBm_x000D_ Working Voltage: 5V_x000D_ Working Current/Sleep Current: 40mA/1.6mA (Typical Value)_x000D_ Working Environment Temperature / Storage Environment Temperature: -10-50 Degrees Celsius / -20-80 Degrees Celsius_x000D_ Size: Approx. 56.5 x 38.5 x 14.5mm / 2.2 x 1.5 x 0.6in