Mini 3.5mm Plug MICRO USB Smart Speaker HiFi Stereo Bass SoundBox Eco Friendly Features: Long battery life, using 3.7-220MAH li battery, sustainable standby for more than 240 hours on a single charge, continuous playback for up to 4 hours, a true lasting battery life. With power supply, charging is fast. Independent power supply design, MICRO USB charging interface, audio-visual does not consume mobile phone power, charging for 1.5 hours at a time. The 3.5mm aluminum alloy plug is compatible with most electronic devices. Precision electronic components, transparent acrylic material, feel more intuitive, black electronic component background color, so that the interior is looming, real material, we do not hide. Exquisite and compact, integrated buttons. Not only the volume is high, but also the sound quality is good. Strong passive radiation, not only to increase the volume, but also improve the sound quality, let you experience the lossless sound quality. 5 times the sound amplification, increase the sound, enhance the sense of the audiovisual, let the ear immersive. Specification: Material: ABS Color: Transparent + Black Frequency: 80Hz - 20kHz Signal to noise ratio: 80dB Battery: Lithium Ion 3.7V 220mAh Working Hours: 4H Battery Charging Time: about 1.5 hours Charging Port: Micro USB Size: Approx. 6 * 4 * 3.2 cm / 2.4 * 1.6 * 1.3 in Package Weight: 76 g Package list: 1 * Bluetooth Speaker 1 * USB Cable Note: The decibel value is increased by 3DB, which means the sound is doubled.