AXESS MPWL1503 Wireless Headset Microphone with Hands Free Mic Clip and Headphone to Mic Line-in Converter Working Range (150 FT.) Included- 6.3 adapter to a 3.5 mm 2 Set Micorphone head set and Clip-on Microphone Wireless Receiver for Enhanced Mobility High-power Magnet for Better Performance/Frequency Range: 110 MHz-120MHz (batteries in package are not for commercial use) Product requires a powered (not passive) output device (speaker, amplifier, mixer) for use. (Please be sure that the receiving unit is connected to the output device via a microphone jack or auxiliary jack)