Wireless Freedom: (line of sight) to freely move around during performances, suitable for indoor and outdoor activities, such as home karaoke, church, wedding, conference and small stage performance. Compatibility: Superior signal stability, compatible with karaoke machine, powered speaker, amplifier, mixer, audio interface. (NOTE: the system is not compatible with phones, computers and tablets.) Stable Signal: Just turn on the system, then the receiver will sync the frequency with the transmitter automatically. 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. What You Get1 x handheld microphone, 1 x receiver with a 6.35mm plug, 1 x anti-slip ring, 1 x mic cover, 1 x USB charging cable . Note: 2*AA batteries are required for each mic (not included). Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.