What You Get:2 x handheld microphone, 1 x receiver with a 6.35mm plug, 2 x anti-slip ring, 2 x mic cover, 1 x USB charging cable, 1 x manual. Note: 2*AA batteries are required for each mic (not included). Rechargeable Battery: The rechargeable and portable receiver only needs to charge for about 2-3 hours and can be used up to 6 hours. Both mic and receiver are made of rugged metal, which has strong impact and corrosion resistance. Stable Signal: Just turn on the system, then the receiver will sync the frequency with the transmitter automatically. 15 adjustable channels to get rid of radio interference, up to 15 sets can be used simultaneously. Compatibility: Excellent signal stability, compatible with powered speaker, karaoke machine, amplifier, mixer, and audio interface. (NOTE: the system is not compatible with phones, computers, or tablets.). Wireless Freedom: 200ft operating range (line of sight) to freely move around during performances, suitable for indoor and outdoor activities, such as home karaoke, church, wedding, conference, speech and small stage performance.