Becoming frustrated with wires catching your arm whilst running or working out? Then it is worth considering the option of wireless Bluetooth headphones, save space effortlessly. To sync the headphones with the device simply hold down the play button until the light flashes red/blue. Once the light flashes, make sure the Bluetooth function is set to on. The headphones should be discoverable as "Sport BT". Select the device to sync. Simply place a Bluetooth compatible device such as a phone, MP3 player or iPod in your pocket, armband or any alternative safe place and let the earphones do the rest. They can Sync flawlessly with your device whilst delivering crystal clear sound. Punch out that PB, smash those sit-ups or power through press ups with the sweat-proof Bluetooth Sport headphones. Strong, waterproof and sweat proof design. Bluetooth 3.0 Noise Reduction Stereo , 96KHZ Talk/ playing time up to 5 Hours Standby time 180 Hours Power source: Built-in Li-ion Battery (USB Charging)Support system: IOS, ANDROID, WINPHONE, SYMBIAN , MAC OSX and WIN7/8