Syllable D700 Noise Canceling Premium Sound with Bass and Microphone Running Wireless Bluetooth Headphones and Sport Armband for iPhone iPad Samsung and More(Armband+Yellow Earphones) The Highest Standard Parameters:Bluetooth 4.0 achieves the goal of energy conservation. Sweat-proof, durable design, Onscreen Battery Meter, Up to 5 hours of Talk/Playing Time and 180 hours Standby Time. PureSound In-ear white noise and listener fatigue reduction. Eliminate Stable and strong signal: Bluetooth 4.0 technology,the signal strength is nearly twice times than the general bluetooth headset in the market.the signal is stable no matter you turn left/right or other directions of the body. High Compatibility and English Prompt Voice: Compatible with Bluetooth enabled music players & A2DP enabled devices. it supports all most devices which have bluetooth function