GOOLOO Portable Stereo Bluetooth 4.1 Headset Over-the-head Wireless Hands-free with Mic, Noise Cancellation (Black Bluetooth Headset) 1. Bluetooth 4.1 with A2DP support for stereo sound/music, connect up to 2 devices at the same time 2. Comfortable, balanced design, over-the-head style, rotatable microphone for both left and right ear 3. Standby time: up to 220 hours(9 days); Music time: up to 5 hours; Charging time: 2 hours; Roaming freely with 33ft of range for up to 13 hours of continuously talk time 4. World-Class HD Sound Quality with Superior 4x Noise Cancelling Technology 5. What You Get: GOOLOO Bluetooth 4.1 Headset, USB Cable , our fan-favorite 18-month warranty and friendly customer service