Supply voltage can be between 3.6 to 6V DC. I/Os are 5V tolerant.
Bluetooth V2.0+EDR (Enhanced Data Rate) 3Mbps
Bluetooth SPP (Serial Port Protocol)
Easy to connect this module with any standard Bluetooth device, just search and key "1234" passcode.
Baud rate: 38400 bps.
Module requires no setup.
Dimensions: 1.73 in x 0.63 in x 0.28 in (4.4 cm x 1.6 cm x 0.7 cm)