Zealot S51 Pro Shocking Bass Bluetooth Speaker with Colorful Light Feature: 1. High volume without breaking sound! No matter where you place the speaker, 360 degree surround sound technology ensures that its sound spreads evenly. 2. 57mm loudspeaker release the surging sound waves. Dual diaphragm for high and low frequency horn and bass, accurately capture every fluctuation, surging and dynamic, making the sound more natural and transparent. 3. The amazing colorful lights and music creates a full atmosphere and enjoys the sound experience from the music scene. 4. Built-in 6000mAh large battery, no fear of long-term outdoor play, parties, etc., travel without restrictions. 5. Using Bluetooth 5.2 technology, it provides you with strong and stable signal transmission and low-power operation mode. 6. Support two speakers in series, left and right channel independent output to create a more shocking stereo sound subwoofer. Parameters: 1. Bluetooth version: 5.2 2. Transmission distance: about 10m 3. Music listening time: about 3H-5H 5. Charging time: about 3H 6. Signal-to-noise ratio: greater than or equal to 85dB 8. Working voltage: 7.4V 9. Frequency response: 20Hz-20KHz 10. Battery capacity: 6000mAh 11. Speaker: 57mmx2 12. Distortion: less than 1%