PartyBox 400 portable Bluetooth player is a set of two speakers controlled by a smartphone via Bluetooth or built-in buttons. With 20W RMS power, it offers a working time of 4 to 8 hours. The speaker features Bluetooth, FM radio, USB pen drive, microSD card, AUX, and karaoke functions. The multicolour RGB backlight operates in several modes, providing unforgettable visual effects. The PartyBox 400 has a built-in rechargeable Li-Ion 1200mAh 3.7V battery, charged via micro USB. Its frequency response ranges from 40Hz to 20kHz. Inputs include a 6.3mm mono microphone socket, a microSD card slot for playing MP3 files, and a USB socket for connecting a USB flash drive with MP3s. A USB (M) to micro USB (M) cable and AUX cable are included. Dimensions: 400 x 165 x 155 mm.