Bluetooth version: 4.0+edr Support profiles: a2dp , avrcp , hfp , hsp Operation distance: 10m; Rechargeable lithium battery: 400mah Talking time: 8-10 hours Music playing time: 8-10 hours Carton size:460*275*335mm Qty:20pcs Weight:15kg 1. Language: english 2. Fashion style 3. Support bluetooth and sd card play 4. Mini usb 5v charge 5. Hands-free call, take/end/reject call 6. Voice guidance/control, play/pause music 7. Compatible with all external 3.6 mm jack 8. With fm automatic searching 9. Battery power shows 10.Intelligent charging:overcharge/overdischarge protection 11.Two portable devices are connected at the same time