Technical Parameters: 
<br />1.Bluetooth version: Bluetooth 4.1 
<br />2. Charging voltage: DC 5V 
<br />3. Charging time: 2 hours 
<br />4. Working time: 5 hours 
<br />5. Effective range: 10m
<br />6.Color red black gold silver blue
<br />Package Size(L x W x H): 7.50 x 7.50 x 4.00 cm / 2.95 x 2.95 x 1.57 inches
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<br />Package Contents: 
<br />1 x  Receiver,
<br />1 x Charging Cable,
<br />1 x Bilingual Manual