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feature: 1. bluetooth speaker with stylish appearance is not only high-end, but also durable. 2. bluetooth wireless transmission, support hands-free calling 3. support tf card auto play function 4. support audio output, can be connected to computer, mobile phone, mp3 and other audio interfaces 5. small body drive, large capacity, super loud volume, strong and powerful treble 6. it is sought after by customers at home and abroad. specification: speaker type: portable bluetooth speaker adjustment method: key features: bluetooth audio input, bluetooth hands-free calling, line in, tf card power supply: dc 5v, lithium battery (300mah) effective power: 3w s / n ratio: ﹥ 80db distortion rate: ﹤ 0.5% @ (1khz) frequency: 90hz-20khz audio interface: 3.5mm impedance: 4ω playing time: 1hours bluetooth version: bluetooth2.1 working frequency: 2402-2480mhz transmission range: up to 10 meters, the data is measured in an open and unobstructed area. walls and buildings may affect signal transmission material: abs the packaging includes: 1 * bluetooth speaker 1 * usb cable Have a nice day! Welcome to visit.Hope you have a nice day! we will be ready to reply you ASAP. If you need more this item ,you can contact us.we will give you our best price. Leave your message!