Product specifications: 1. Waterproof: No 2. Communication: AUX, Bluetooth 3. Support APP: 4. Speaker material: metal; carabiner material: metal 5. Support memory card: 6. Built-in microphone: 7. Cross audio: two-way 8. Voice control: No 9. Play function: MP3, other 10. Support Aptx: 11. Output power: 10W 12. Chann: 3 (2.1) 13. Frequency range: 80Hz-20KHz 14. WiFi music: APP 15. Bluetooth version: Bluetooth 4. 016. Bluetooth protocol: HFP, HSP, AVRCP, APTX 17. Battery capacity: 4000mAh lithium battery 18. Talk time: 20 hours 19. Playing time: 20 hours 20. Charging time: 8 hours 21. Product size: 170mm x 72mm x 72mm 22. Net weight: 423gFeatures: 1. Bluetooth 4.0 chipset stable signal transmission, powerful audio decoding, 10 meters operating distance, exclent compatibility, suitable for all ectronic devices that support Bluetooth, including smart phones, smart TVs, laptops, MP3, etc. 2. Integrate a sensitive touch control pan, song switch, play mode switch, volume control, play/pause 3. Dual high-definition speaker driver units, 2.0-chann 360-degree surround strong b and stereo HiFi sound effects. 4. Support AUX line output music play mode, use standard 3.5mm audio cable to connect the speaker to mobile phone or tablet to play music even if your device does not have Bluetooth function, it can also be used as a wired speaker 5. Built-in Micro SD card slot, support TF card play mode, insert TF card with downloaded songs to play music, support MP3/WMA format songs 6. The speaker has a built-in 4000mAh super-capacity lithium battery, long standby and use time, talk time/play time up to 20 hours 7. Speaker with USB charging port, 4000mAh battery can be used as a power bank for mobile phone charging 8. Noise reduction function supports HD Talking, built-in sensitive high-definition microphone, hands- support, even when playing music or driving