products description: This wireless microphone is adopted 2.4Gwireless technology, using professional ID code encryption transmission technologyand automatically pairing devices. It can be easily removed and installed, usedon most audio devices, like video player, loud speaker, power amplifier, soundconsole and so on. It is a great choice for teaching, tour guide, conference, speech,etc. Feature: 2.4G wireless technology, and the transmissiondistance can be up to 40m without directional restriction. Omni-directional and sensitive voice receiving,minimizes the harmonic distortion and keeps your voice loud and clear all thewhile. Professional ID codeencryption transmission technology, each producthas a separate ID code, multiple devices can be used simultaneously at the sameplace without disturbing. With 3.5mm and 6.35mm connector, just plugand play, it will automatically match devices while power on. Wide Compatibility, fit well with most audio devices, like video player, loud speaker, poweramplifier, sound console and so on. The transmitter is equipped with a lithiumpolymer battery, which can be used for more than 10 hours continuously. Small and light, comfortable for wearing,and easy to install and remove. Micro USB universal interface for easycharging. Spezifikations: Input Voltage: DC3.5V-5.5V Current: ≤ 40mA Battery Type: Lithium Polymer Battery Charging Time: < 4h Working Time: ≥ 10h Frequency: 2400 - 2483 MHz Frequency Type: GFSK Transmission Distance: 40m RF Transmission Power: 10dBm Sensitivity: -88dBm S/N Ratio: ≥65dB Sampling Frequency: 16KS/s Op