Update old-school devices with this ABS plastic device by plugging in a 3.5 mm cable to turn it into a wireless headset. Made of ABS plastic with a clip-on back, each piece comes packed in clear PVC pouch with snap closure and a carabiner attached. Power/technology: rechargeable Lithium Polymer battery. It features an LED status light and the device lights up red while charging and turns off when charging is complete. Functions include call answer/hang-up, mute, volume, music play/pause/up-down song selection, skip and voice prompt. It must be charged prior to first use. Charge time varies by device, minimum 2 hrs.