Sport Bluetooth Headphones, TeckNet Groove Bluetooth 4.0 SweatProof Wireless Earphones with Noise Cancelling Microphone,Hands-Free Calling,10 Hours Playback, 550 Hours Standby Keep your tunes playing all day long! A built-in, rechargeable Li-ion battery delivers up to 10 hours of power (depending on your music settings) and 550 Hours standby time Lightweight and small, perfect for sports. Designed for comfort, these compact earbuds won't get in the way while you're training, running or working out at the gym. They're so light you'll hardly realise you're wearing them! A long, slender sound tube keeps headphones secure: A critical factor in the design of sports headphones is the length and diameter of the sound tube. These headphones sport an extra long tube with a small diameter for a secure and stable fit, no matter how high intensity your workout. The smaller diameter also helps keep the headphones compact 3 sizes of detachable earbud offer a snug fit; just choose the bud that's right for you. The durable, slip-free silicone bud design comes in a choice of three sizes - small, medium and large - you'll always enjoy a snug, custom fit with these earbuds One button control for smartphone calls. A simple, one-button operation on these headphones lets you answer hands-free calls so you can stay in touch while listening to music on your iPhone or Android smartphone.