TryAce HV-900 Wireless Music A2DP Stereo CSR Bluetooth 4.0 Headset Universal Vibration Lightweight Neckband Style Headphone Earphone - White Built with CSR Bluetooth 4.0 chipset guarantees solid performances and connection stability within 10 meters operational range Enhanced stereo sound quality with A2DP profile support, experience high quality music and calls at affordable price Connect Two Devices at The Same Time and dont miss your calls when you have two cell phones Ultra durable built-in rechargeable lithium battery provides up to 8 hours music time, 15 hours talk time and up to 15 days standby time Unique around-the-neck design that's lightweight and comfortable for all-day use