Universal Waterproof Bluetooth Portable Speaker 4000mAh Power Bank Outdoor Sport Applicable for Smartphones - Blue

Specification: 1. Bluetooth version: 3.0 2. Wireless transmission power: CLASS2-4dBm 3. Wireless working frequency: 2.4GHz 4. Charging time: 5 hours 5. Battery capacity: 4000mah 6. Wireless range: 10-