Specifications:
Bluetooth Version:4.0
Bluetooth Profile:a2dp/HFP,HSP,AVRCP.GAVDP,AVDTP
Speaker Type:Bone conduction technologyspeaker,1W dual speakers
Battery:230mAh polymer battery
Mic:Anti-interference microphones(-50DB)
Frequency Range:20-20KHz
Effective Range:10m (33feets)
Receiving Sensitivity:88dBm
Frequency Range:20-20KHz
Standby Time:10 days
Item Weight:Approx 57g
Indicator light status
Red light flashing rapidly: lack of power
Red light on: charging
Blue light on: full charged
Blue and red lights flashing: matching
Blue light double flash slowly: fail to match, maybe the device is power off, or the distance of both is over15m

Blue light flash slowly: Matched/dialing/playing audio.
Package size:149*122*55mm