Features: Adopting UHF (ultra-high frequency) band and double channels, the wireless microphone set has the advantages of strong anti-interference. A/D and D/A are used for high performance audio of 24 Bit / 48KHz; using the code+ frequency to encrypt the data, improving the stability of connection. With automatic mute and shock elimination circuit to the impact and noise of switching machine. Extremely high pick up sensitivity and excellent tone quality make your speech or singing more clear. The wireless transmission distance is about 30 to 50 meters; multiple devices can be used simultaneously without interference of frequency hopping. UHF wireless microphone set suit for business meeting, speeches, teaching, live performance, etc.. Specifications: Transmitter-- Frequency : UHF Channel Number: 10 (conservative values) each time matching, code random change, within the frequency set by the manufacturer Oscillator Mode: DSP chip frequency lock Frequency Stability: ± 10ppm RF Power: 10dBm Sound Frequency: 40~18000Hz Distortion: ≤0.5% Battery Specification: 1.5V x 2/ two AA Size alkaline batteries (batteries are not included) Endurance: 4~8hours (depending on battery type and capacity) Transmitter Size: 9.1 * 6.5 * 1.9cm / 3.58 * 2.56 * 0.75 Transmitter Weight: 69g / 2.43oz Receiver-- Frequency : UHF Channel Number: 10 (conservative values) each time matching, code random change, within the frequency set by the manufacturer Vibration Mode: DSP chip frequency lock Rate Stability: ± 10ppm Receiving Sensitivity: -95~ 71dBm Sound Frequency: 40~18000Hz Distortion: ≤0.5% SNR: ≥ 90dB Audio Output: 300mv(maximum) Power Supply: built-in 500mAh rechargeable battery Receiver Size: 12.3 * 3.4 * 2.4cm / 4.84 * 1.34 * 0.94in Receiver Weight: 40.2g / 1.42oz Package Size: 29 * 13 * 6.5cm/ 11.4 * 5.1 * 2.6in Package Weight: 310.8g/ 10.96oz Package List: 1 * Receiver 1 * Transmitter 1 * Lavalier Microphone 1 * Headset Microphone 1 * Antenna 1 * USB Cable 1 * 3.5mm Converter 1 * User's Manual (English)