JoyiQi Sport Wireless Bluetooth Headphone Headset Earphone For Smartphone 1. Bluetooth Headphones equipped with Bluetooth 4.1+EDR technology and the microphone allowing you to listen to music and answer call from your cell phone as far away as 33 ft/10 m. 2. Built-in Rechargeable Li-Polymer Battery, the bluetooth Up to 5 hours of talk time or 150 hours standby. 3. Comfortable in-ear design with interchangeable earhooks, you can choose the size what you need. 4. Multi-pairing: It can connect with 2 cell phones or tablets simutaneously. Simple-to-use, control all functions of your music (volume, sound, song selection) and calls from your phone via our simple-to-use user interface on the headphones themselves. 5. Universal compatibility: Works with iPhone, Android Smartphones, tablets, iPod touch, and other Bluetooth devices.