Features:Sound Equalization - The Bluetooth speaker adopts two 2-inch full-range speakers to achieve a balanced stereo output. The treble is clear and bright, the mid is full and natural, the bass is dull.Long Battery Life - Built-in 4500mAh lithium battery provides 4.5-5 hours of working time. You can also charge the Bluetooth speaker while using, no need to worry about battery life.Remote Control - Uses audio cable to connect two speakers together for immersive stereo sound experience. IR remote control allows you to set and adjust the speaker and mics as needed.Auto Mic Connection - This speaker can automatically connect two microphones at the same time. Microphone and speaker can be set to the same frequency to prevent crosstalk interference.Microphone with Echo/Reverb - Fixed echo sound effect enhances the penetration of the human voice, and reverb can be adjusted by remote control according to personal preference.Specification:Speaker rated power: 30WSpeaker battery: 4500mAhMicrophone battery: 2x AA batteries (Not included)Remote control battery: 2x AAA batteries (Not included)Color: BlackMaterial: ABS