Wireless Sports Headsets Wireless V4.1 Neckband Earphones HD Stereo Sweat-proof Headphones Earbuds

Wireless Version: CSRV4.1
Transmitting Power: Class 2
Protocols Supported: HSP, HFP, A2DP, AVRCP
Driver Unit: φ10mm
Impedance: 32ohm±15%
Talk Time: (LED Off): Up to 8 hours; (LED On): Up to 5 hours
Play Time: (LED Off): Up to 6- hours; (LED On): Up to 4 hours
Standby: (LED Off): Up to 90 hours; (LED On): Up to 13 hours
Charge Time: = 3 hours
Operation Range: =10M
Battery: built-in 120mAh lithium battery
Weight: 0.76oz
Available Colors: green, blue, red, orange