2.4G Wireless Headset Microphone Plug&Play: The transmitter and receiver paired automatically as soon as they were turned on and it worked immediately with no effort Worth your consideration, performer, speaker. It has got power on/off button and when the power is turned on then it connect itself so you do not need to worry about pairing and everything else No complex Set up, Just Plug Receiver into MIC jack of Your Device and turn on Transmitter and Receiver then wait 2 Seconds, they will connect Automatically. Specification: Input Voltage Range: DC3.5V-5.5V Maximum Current: 40mA Battery Type: Lithium Ion Battery Charging Time:<4hours Continuous Working Time :6-8hours Frequency Band: 2400-2483Mhz Modulation Method: GFSK RF Transmission Power : 10dBm Transmission Distance: 25-30min open area),15-20m (with obstacle) depend on working environment What's in the Box: ( The charger would not be included inpackage ) 1 * Headset Mic Transmitter 1 * Receiver unit 1 * "Y"size Phone adapter 1 * 3.5mm to 6.5mm adapter 1 * 2 in 1 USB cable 1 * User Manual Kindly noted: 1.This microphone is not compatible with smartphone . 2.This microphone cannot be connected to thespeaker via Bluetooth. Please noted that the speaker is in Mic option but notBluetooth option if you would use it with your bluetooth speaker. 3.Not suitable for small power speaker equipment. The amplification equipment should be above 100W. 4.Please don't make a squeal on the speakers at close range.