Features:*Long term life, easy to carry, use two 5 battery power supply, can be replaced at any time, free of power trouble, no worry about power supply, use time as long as 8 hours or so.*High quality condenser microphone with high voice restoration and stable signal. The sound quality of ordinary microphone declines after paing for a period of time. High quality condenser microphone core is adopted to maintain the pickup effect continuously.*Real time monitoring function. The receiver is equipped with headphone jack, which can monitor the microphone sound in real time to prevent recording errors.*High frequency radio wave, remote reception, barrier free 80 meter transmiion, transmitter automatically matches receiver, long-distance wirele transmiion, signal stability, constant frequency, no jamming, no delay, anti howling, suitable for indoor and outdoor wirele recording.Specification:Name: Wirele recording microphoneProduct size: 110x65x25mmPower supply: 3VDCPower consumption: 150mAUse time: 8hrsOperating distance: 80mPacking Included:(as you choose )1 x receiver+ 2 x transmitter1 x receiver+1 x transmitterNote: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.