[TWO-YEAR WORRY-FREE GUARANTEE]: ●bietrun provides every customer with TWO-Year-Warranty! If you are not satisfied with this karaoke system or have any other questions, please feel free to contact us before returning. [20W HD STEREO SOUND QUALITY]: ●The karaoke machine has built-in a 6.5-inch 20W full-frequency speaker, bursts out 20W to 300W peak power, loud sound, and utilizes advanced high and low bass separation technology to make sound more clear. [2 MICROPHONES, DOUBLE FUN]: ●Our Bluetooth karaoke machine has 2 microphones, and the microphone switch settings provide individual control.●There are buttons to adjust the microphone volume/ bass/treble/echo on the karaoke machine for perfect karaoke. (●Note: Each wireless microphone requires 2×AA batteries (not included). [PLAY 15 HOURS]: ●It is equipped with a high-capacity 8000mAh battery, providing 12–15 hours of continuous music playback on a full charge, it requires 7–9 hours to be fully charged with USB-C Charging. [BLUETOOTH 5.0]: ●This karaoke machine has Bluetooth 5.0, providing a stable and 65ft (20 m) long-distance transmission for uninterrupted gatherings. Which can be connected to smart TVs, smartphones, tablets, laptops, iPhones, and iPads for karaoke. And through TWS, dual karaoke machines can be connected simultaneously for karaoke. [TWS]: ● Bietrun Karaoke Machine has a TWS function that can be connected to another speaker to form a dual-speaker karaoke system, The sound will form stereo and will be synchronized and get you surrounded by 2 channels. [UHF 160FT WIRELESS DISTANCE]: ● Two microphones has a UHF 160FT(50m) wireless distance connection with the karaoke machine. Automatic connection, easy to use.