Muze &reg; BH-01 Sport Earbud Wireless/bluetooth, Hands-free Sports Music Neckband Earphone Earbuds CSR 8645 Using the latest stereo Bluetooth 4.1 technology Operation range: up to 10 meters Battery time: 4 hours Standby time: 240 hours Compatible - They pair easily and fast with almost all Bluetooth enabled devices, allowing simultaneous connections with two different cell phones or tablets Easy-of-using: control volume, select songs and receive phone calls via the buttons on the interfaces