Features: Supports corded/wireless bluetooth-compatible/USB/memory card playback. Bluetooth-compatible 5.0 chip, stable transmission, low power consumption, strong interferences resistant ability, and almost no delay. Build in K-song dedicated chip, intelligent beautiful sound, 4 types of mute modes switching. 30W horns, dynamic microphone, intelligent noise cancelling, 360 degree surround sound, Hifi sound. Small in size and light in weight, with a portable handle that is easy to carry. Build in large capacity battery+external power double power supply, long battery service life. Specifications: Material: ABS+Electronics Type: with single mic, with two mic(optional) Loudspeaker: about 268x91x128mm/10.55x3.58x5.03inch Mic: about 15x4cm/5.9x1.57inch Microphone connection: wireless connection Wireless microphone distance: 20M (accessible) Microphone: dynamic coils Charging input: 5V2A Loudspeaker power: 15Wx2 Battery specification: 7.4V 4000mAh Frequency: 150HZ-18KHZ Battery service life: 4~6H Charging time: 4H Working temperature: -20℃~70℃ Bluetooth-compatible distance: 10M (accessible) Package Includes: 1pc Loudspeaker with 1pc/2pcs Microphone(optional) note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.