Bluetooth Speaker. ABS UV material. Built-in Lithium-ion battery. Power Supply: Lithium-ion, 520Mah, Computer-USB-in, DC-in. Compatible, mobile / computer / MP3/MP4, Compatible Micro TF, Support TF card (MAX 32GB). 3.5mm AUX in. NdFeB Speaker inside, 2 inches; 4ohms. Output: 3W. Frequency response: 150-20KHz,SNR: more than/equal to 80db. Support Bluetooth and calling Hand free function.