Product information: Power mode: Built-in lithium battery Frequency range: 100hz-20khz Processing Method: OEM Packing List: Color box packaging manual charging cable Applicable personnel: general Functions: card insertion, radio, dustproof, USB port, voice prompt, call function Power type: USB Color: blue, black, red, green, gray Interface Type: USB Applicable scenarios: car, desktop, fitness sports, outdoor, home, mobile/portable, karaoke, live broadcast, square dance, broadcasting system, outdoor lawn Channel: 2 Shell Material: Plastic Operation method: Button Bluetooth specification: V5.1 Wireless transmission range: 10m Battery capacity: about 1200mAh Built-in voltage: 3.7V. Playback Time: About 4H Speaker specification: p 52mmx1 Speaker power channeling: 5Wx1 Size: 136.4*70 * 80mm Functions: Bluetooth connection, automatic shutdown without connection Colorful LED lights with multiple flashing modes FM Radio TF/USB Direct reading LINE IN input DC-5V charging Bluetooth calls can be answered hands-free with one click Large capacity built-in lithium battery