Description: Dual magnetic 16-core alloy speaker, with clear treble, powerful mediant, and full bass, which will give you wonderful music experience Hang the speaker on your bike's fist rail, and keep the connected. You can use it to play music and make hands-free phone calls Three type SOS lamp modes, let you call for help quickly when you are in danger. Press the power button, the speaker becomes a flashlight to light your direction 4000mAh rechargeable battery provides a long time usage and turns it into a backup power supply as well Portable wireless speakers for biking, travel, beach, cycling, riding and other outdoor activities Specification: Version: 5.0 Battery Capacity: 4000mAh Speaker: 4 Frequency Response: 20Hz-20KHz Output Power: 3W Transmission Distance: 10m Operating Voltage: 3.7V Music / Calling time: about 10h Standby Time: 30 days Charging Time: about 5 h LED Power: 1W (3 LED modes: Normal, Weak, Flash) Size: 50x50x156mm / 1.97 x 1.97 x 6.1in Package Includes: 1 * Speaker 1 * USB Cable 1 * User Manual