1、The built-in 400mAh large-capacity battery has a strong battery life and lasts wonderfully. 2、Stunning bass, powerful and powerful sound, with CD-level sound quality reduction performance, super spatial sense of sound. 3、Support mobile memory device memory card or U disk playback, excellent music playback effect. 4、Internal magnetic subwoofer, HiFi sound effect, support FM radio, Bluetooth 4.2, hands-free calling, AUX input. 5、Small and convenient, waterproof and wear-resistant net, removable lanyard design, independent function buttons. 6、The electroplating plastic shell is matched with the rubber paint material to give you a comfortable feel. Condition: 100% Brand New Item Type: Mini Speaker Material: Plastic Housing Color: Silver Gray Function: Support Bluetooth / Memory Card / U Disk / FM / Phone Call functions Speaker Specifications:4Ω 3W Battery Capacity: 400 mAh (Built-in) Bluetooth: V4.2 Working Distance: Approx. 10Meters/32.8ft Voltage: DC 5V Battery Charging Time: 1.5-3H Speaker: 4Ω 3W Signal To Noise Ratio: ≥95db Frequency Response: 280HZ-16KHZ 1 x Speaker 1 x USB Cable