Main Features: Neck strap design, cable length adjustable Noise and echo cancellation function Can connect two phones at the same time Incoming phone call vibration function One-button control, easy to reach and hang up phone calls. Specification:   Model- HBS-730 Color-White Wearing type- Neckband Feature -Neck strap, Two-link, Vibration Function -Voice control, Microphone, Answering phone, Song switching, Bluetooth, Noise Cancelling Connectivity- Wireless Plug interface -Micro USB Power supply -3.7V 180mAh rechargeable battery Working time -Talk time: 15 hours, Music play time: 10 hours Standby time -About 300 hours Charging time- 2 hours Extended Function- Bluetooth -Yes Bluetooth version -V2.1 EDR Bluetooth distance -W/O obstacles 10m Bluetooth model -Headset, Hands free Dimension and Weight Product weight 30 g Product size (L x W x H) -16.5 x 12.0 x 1.5 cm / 6.5 x 4.7 x 0.6 inches Package size (L x W x H) -24.0 x 19.0 x 5.0 cm Package contents 1 x Bluetooth Earphone,  1 x Ear Clip, 1 x USB Charging Cable, 1 x User Manual