HC-06

HC-05 Bluetooth Module
A breakout board for easier connectivity
Designed for 3.3v level ttl but will accept 5v level as well
Built in antenna with a range of up to 30 feet (range is dependent on a lot of things such as any obstacles or walls in the way so it may vary)
Supports baud rates from 1200 to 1382400 bps (default is 9600 bps)
VCC input voltage 3.3v to 6v
Bluetooth Specification v2.0+EDR
simple to use AT command ie, to set the pairing passkey to 1234 just use AT+PIN1234

Package size: 9 * 3 * 1cm
Package weight: 8g