Broad&reg;new Sport Neckband Headsets Headphones,wireless Stereo Bluetooth Earphones Earbuds with Aptx, Noise Reduction,echo Cancellation,voice Guidance,sweat-proof for Iphone,samsung/smart Phones Unique wearing style: light weight, flexible neckband design with crystal clear sound. With 170mAh capacity, it offers 4-6 hours talk time, 7 hours play time, and 36 hours standby time CSR 8635 bluetooth 4.0: perfect for on-the-go usage, roam away from your connected device (without walls/doors) and still keep the connection. And when you've got your mobile device with you, you can leave within 10 meters Built-in microphone & vibrating call alert: make and take calls safely and easily, no matter what you're doing. Voice guidance: easily to operate the headset. Call, Answer and Redial the last number Battery status alert: to check the battery status, press and hold the Volume DOWN button for a second. There are 3 levels of battery status: