2.4G Wireless Headset Microphone Transmitter Receiver Portable Auto Pairing for Teaching Guide Description: This wireless microphone is adopted 2.4G wireless technology, using professional ID code encryption transmission technology and automatically pairing devices. It can be easily removed and installed, used on most audio devices, like video player, loud speaker, power amplifier, sound console and so on. It is a great choice for teaching, tour guide, conference, speech, etc.   Features: 2.4G wireless technology, and the transmission distance 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 the while. Professional ID code encryption transmission technology, each product has a separate ID code, multiple devices can be used simultaneously at the same place without disturbing. Wide Compatibility, fit well with most audio devices, like video player, loud speaker, power amplifier, sound console and so on. The transmitter is equipped with a lithium polymer 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 easy charging. Specifications: 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 Operating Temperature: 0℃ ~ 40℃ Quality Certification: FCC, CE Color: Black Suitable for audio and loudspeakers Package Weight: 120g Package Size: Approx. 17 * 14 * 4cm   Package List: 1 * Transmitter 1 * Receiver 1 * Headset Mount 1 * 6.35mm Adapter 1 * 2 in 1 Charging Cable 1 * User Manual   Note: This 2.4G wireless microphone needs to be used along with audio amplifier, and cannot be amplified independently. Audio amplifier is not included.