Specification:
Bluetooth Version: 3.0
Chip: CSR BC5
battery capacity:
Battery Type:
Charge and discharge times:
Operating voltage: 3.3V-4.2V
Talk time: 8 hours
Standby time: 120 hours
Charging time: 2.5 hours
Radio frequency :( Japan) 76M-108MHZ
RDS: No
Speaker power: 0.25W
Waterproof:
Have TTS: None
Have automatic volume adjustment: Yes
Operating temperature range: -10 degree to + 45 degree

Feature:
Under ideal conditions the maximum call between two user distances up to 1200 meters， truly in full duplex wireless communication between Bluetooth system of four riders
Helmet intercom market's first Bluetooth-based development of people at the same intercom function
Automatic safety receives phone calls
Bluetooth CSR BC5 master plan
Advanced A2DP !#!amp!*! EDR Bluetooth
Strong shake stereo music / audio function (using the A2DP transmission phone / MP3 / GPS)

Attention please!
If you want to intercom with others， you need to buy more than 2 intercom.
It can support Max 5 pcs intercom connection.
.
DSP noise cancellation:
Built-in lithium polymer battery capacity 500 mA
Standby time: 240 hours
Continuous talk or listen to music more than eight hours
Charging time about 3 hours
National 5 waterproof standard
FM tuner
5 people can talk at the same time