Advanced Wireless And Digital Technologies Provides Stereo Hi-Fidelity Without Wires - Mini USB Transmitter - Reception Range: 10m 360 Degree - Distortion: <0.1%.PC With USB Audio Streaming Capability Through USB Port - Active Noise Reduction Function - Transmit Power: 4dbm - Working Power: 3.5-4.2V.Microphone Function Via USB - Rechargeable Batteries Built-In To Headset - Frequency Range: 2.4G - 2.48ghz - Speaker Size: 30mm.Devices With Audio Out Connectors Like TV, iPod, MP3, MP4, CD Player, Etc. Can Also Be Connected - USB To MINI-USB 5PIN Charging Cable - Frequency Response: 20- 20000Hz - Headset Size: 2.16 x 5.12 x 5.71 Inches.When Fully Charged, The Built-In Rechargeable Battery Can Support About 8 Hours Operation Time - Frequency Carrier: 2.4ghz - S/N Ratio: >80db - Headset Weight: 8 Oz. The PPCM20 is the best way to listen to music wirelessly. It includes a dock with auxiliary input capable of transmitting audio from any device with a 3.5mm jack, plus a USB stick that plugs into your computer, so you can listen to your PC or Mac audio wirelessly. Plus, the PPCM20 headphones have a microphone, so you can use them as a headset for gaming, voice chat, and video calling. The headphones run on built-in rechargeable batteries that last up to 8 hours - to recharge, simply connect them to your computer’s USB port. Using 2.4 GHz wireless technology, these headphones have a wireless range of up to 40 feet.