Waterproof: Yes Material: Plastic Playback Function: MP3 Frequency Range: 75Hz-20KHz Audio Crossover: Full-Range Bluetooth Motorcycle Helmet Speaker Hands-free calls Bicycle Speaker speakers Bicycle sound loudspeaker Automatic Support APP: Yes Communication: Bluetooth Speaker Type: Portable Channels: 1 Battery: Yes Number of Loudspeaker Enclosure: 1 Output Power: 3W Power Source: Battery Model Number: AV110 Operating voltage: 3.4-4.3v Operating Current: Less than 50mA Working temperature: -20degree Celsius -55degree Celsius Standby current: 0mA Maximum temperature: Less than 70degree Celsius Bluetooth connection distance: 10m Audio Frequency Response: 120Hz-12KHz Audio Distortion: Less than 1% Audio 60dB Battery: Polymer 400mAh Volume: 77*23*14mm Dust: IP54 Wireless Bluetooth, 15m transfer, adjusted music 3 seconds, automatically the phone Low battery tips For outdoor , hiking. colour: black Package Contents: 1 * sound loudspeaker Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.