Features: - Immersive Hi-Fi Sound - Adjustable Headband - Rotatable Design - Hands-free call and built-in mic - Comfortable Padding Specifications: Bluetooth Version: V4.1 Working Distance: Up to 10M Impedance: 32? ±15% Driver: ?40mm Frequency: 2.4GHz-2.4835GHz Talking/Playing Time: Up to 100 hours Battery: 300 mAh rechargeable, non-replaceable Lithium ion-polymer Power Requirements: 5V DC Standard: BG-BT201810 What's in the box 1 x Stereo Wireless Headset 1 x 3.5mm Aux Cable 1 x Micro-USB Cable