Bluetooth Headphones, BlueFit Wireless Headset with Microphone, HD Stereo Earphones Earbuds for Workout, Running & Sport Bluetooth V4.0 with CSR 8635 Chipset from U.K.: Perfect for on-the-go usage, roam away from your connected cellphone (without walls/doors) and still keep the connection. And when you've got your cell phone with you, you can leave within 10 meters. Unique Wearing: Light weight, flexible neckband design with clear sound. 170mAh capacity, up to 6 hours talk time, 10 hours play time, and 240 hours standby time. Built-in Microphone & Vibrating Call Alert: make and take calls safely and easily, no matter what you're doing. Voice Guidance: Operate the headset easily. Call, Answer and Redial the last number. Battery Status Alert: To check the battery status, press and hold the Volume DOWN button for one second. There are 3 levels of battery status: "battery high","battery medium" and "battery low".(The battery status indicator will appear on the iPhone screen).