Steering wheel bluetooth handsfree car kit

1. Features:
With voice dialing
Answer and End a Call
Reject a Call
Redial the last number
Built-in Speaker
Built-in Microphone
+and "-" to adjust volume
DSP Technology
Full Duplex
Noise& Echo Suppression
Wind noise suppression
Bluetooth AFH support
Built-in Li-ion battery
Low active and stand-by power consumption

2. Specifications:
Bluetooth Version: 2.1+EDR
Frequency Range: 2.4GHz Spectrum
Connection distance: 0~10M
Microphone effective range: 0~ 1M
Charger Input Voltage: DC12V-24V
Li-Battery capability: 220mAH
Standby Current: 0.3mA
Standby time: More than 15 days
Dimensions: 81(L)*57(W)*28(H) mm
Weight: 50g
Operating temperate: -10~70 degrees
Storing temperate: -20~80 degrees