Technical Details
Link of the documenthttp://m2.img.dxcdn.com/CDDriver/sku.121326.pdf
It's HC-06 bluetooth module.
Allows your device to both send or receive the TTL data via Bluetooth technology without connecting a serial cable to your computer.
Works with any USB Bluetooth adapters.
Default Baud Rate: 9600,8,1,n.
Built in antenna.
Coverage up to 30ft.
Bluetooth version: V2.0+EDR
Operating voltage: 3.3V
Default Baud Rate: 9600,8,1,n.
Signal coverage: 30ft
Cable length: 21.5cm
Item size: 4.3 * 1.6 * 0.7cm
Item weight: 3g
Package size: 9 * 3 * 1cm
Package weight: 8g

Commercial Series
Bluetooth module board Series
With LED indicator light, use 150mA and 3.3V regulation chip.
With VCC?GND?TXD?RXD foot for the Bluetooth
With "Re-seach" button(ON/OFF/WAKE foot for it , external MCU outinput "High level" can control module to re-seach)
Compatible with bluetooth master module"?slave module"or master-slave(whole) module.
Input voltage: 3.3~6V
Size: 1.55cm*3.98cm
More details can be found in http://wiki.sunfounder.cc/index.php?title=Bluetooth_Transceiver_Module_HC-06