Features:* This wirele microphone set adopts UHF (Ultra High Frequency) frequency band with strong anti-interference ability. High sensitivity and good sound quality, suitable for busine meetings, performances, teaching, live performances and other occasions.* Using the UHF (Ultra High Frequency) frequency band, the wirele microphone has the advantage of strong anti-interference ability.* Very high sensitivity and good sound quality make your speech or singing more clear.* The transmitter is powered by 2 AA batteries (not included) and the receiver is powered by a 1200mAh rechargeable lithium battery.* The transmitter and receiver are far away, suitable for busine meetings, speeches, teaching, live performances, etc.Specification:Transmitter:Frequency range: 677.7~696.30MHzNumber of channels: 16 (each time pairing, the ID code changes randomly, within the frequency range set by the manufacturer)Oscillation mode: DSP chip frequency lockingFrequency Stability: 10ppmRF power: 10dBmAudio frequency response: 40~18000HzDistortion: 0.5%Battery: 1.5V AA alkaline battery (without)Use time: 4~8 hoursReceiver:Frequency range: 677.7~696.30MHzNumber of channels: 16 (each time pairing, the ID code changes randomly, within the frequency range set by the manufacturer)Oscillation mode: DSP chip frequency lockingFrequency Stability: 10ppmReceiving sensitivity: -95~-71dBmAudio frequency response: 40~18000HzDistortion: 0.5%Signal-to-noise ratio: 90dBAudio output: 300mVPacking included:1 * Transmitter1 * Receiver1 * Lavalier /Headset Microphone1 * 3.5mm Cable1 * 18650 Battery(not included)Note:1. Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting.2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.