Waterproof: Yes Material: Plastic Playback Function: MP3 Frequency Range: 75Hz-20KHz Audio Crossover: Full-Range Bluetooth Motorcycle Helmet Speaker Hands-free calls Bicycle Speaker Riding speakers Bicycle sound loudspeaker Automatic answer 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 or equal to 50mA Working temperature: -20°C to 55°C Standby current: 0mA Maximum temperature: Less than or equal to 70°C Bluetooth connection distance: 10m Audio Frequency Response: 120Hz-12KHz Audio Distortion: Less than or equal to 1% Audio equal: 60dB Battery: Polymer 400mAh Volume: 77*23*14mm Dust: IP54 Wireless Bluetooth, 15m transfer, adjusted music 3 seconds, automatically answer the phone Low battery tips For outdoor riding, hiking Color: Black Package Contents: 1 x 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 to be a little different from the real thing. The measurement allowed error is +/- 1-3cm