DUAL FREQUENCY CHANNEL: 2 wireless microphone system by Boytone has dual frequency channel and broad audio response range with low distortion so you can enjoy cordless singing to karaoke music and mobility for energetic on stage performance Microphones provide up to 15 hours of wireless operation on a single 9V alkaline battery includedCLEAR SOUND & STABLE SIGNAL: Each microphone operates on a single separate channel in the high-band VHF range for reliable This professional portable wireless microphone set has a channel frequency range of 174~216MHz and high signal over noise ratio performance for capturing high quality audio. Ideal for professional engagement conferenceINDEPENDENT MICROPHONE: Each dynamic mic features its own Mute off & on power for a karaoke experience that both kids and adults will enjoy. Perfect for PA karaoke Dj party conference. Each microphone operates on a single separate channel in the high-band VHF range for reliable interference-free performance and excellent high-fidelity audio. 164+ ft. typical operating range — up to 300+ ft. line-of-sightCONVENIENT POWER SWITCH: Both the receiver and the mic has a power ON / OFF switch and the receiver has LED status signal indicator light and dual independent antenna. Plug your unit into your mixer amplifier or speaker with a 1/4 mono cable AC Adapter 110 to 240 voltWHAT S IN THE BOX: with the caring case the package includes a receiver and 2 wireless handheld dynamic transmitter mic. 2x 9v battery. The device can be used outdoor and indoor like a school classroom church or at home for personal use.