1. Powered by advanced Bluetooth 4.0 technology, energy saving, faster and more stable transfer, outstanding connection range up to 33 feet. 2. IPX6 waterproof rating ensures protection against splashing water, suitable for outdoor, shower and other wet environments. 3. Two 40mm total 7W high-end acoustic drivers and built-in proprietary passive bass radiator provide a complete listening experience. 4. Built-in 1700mAh Li-ion rechargeable battery for up to 8 hours of wireless playtime on a single charge when streaming music or hands-free calling. 5. NFC (near field communication) technology for easy and instant connection. (If your Bluetooth audio device has NFC function) 1.Bluetooth: Bluetooth 4.0 2. Effective distance: 33 feet/10m 3. Rated power: 7 watts 4. Bluetooth profiles: A2DP, HFP, HSP, NFC 5. Wire port : Micro-USB and 3.5mm aux line-in 6.Built-in MP3 player: Supports playback of MP3, WMA, WAV, APE and FLAC formats with Micro 7.SD card (micro-SD card is not not included in the package) 8. Battery: Built-in 1700mAh Li-ion rechargeable battery, about 8-10 hours of continuous playback (varies by volume level and audio content) 9. Size: 4.8x1.8x2.5 inches (LxWxH) 10. Weight: 10.3 ouncesNote: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.