iDoo Bluetooth 4.0 Wired / Wireless Headphones with Built-in Microphone - Black / Red Can be used both wired (via the 3.5mm audio cable) and wirelessly(via Bluetooth 4.0 EDR). Up to 20 Hours of Music playing &taking time,standby time more than 250 hours. Special speaker transmits high fidelity & powerful bass and detailed wireless sound to your ears. Advanced microphone system for clear calls in windy or noisy environments. Built in microphone for heaAdvanced microphone system for clear calls in windy or noisy environments.dset functionality with controls for media and phone calls.