Product Details : These are the go to choice for a premium device that puts in the state of Flow. Tune Out the noise, and don't let any of that rock your boat. Flow is all that Matters. Choose Quality. Choose Powerzz! 
 
Specifications:
Bluetooth compatible version: 5.0 
Charging voltage: 5V Li-Po 
battery : 200mAh frequency range (HZ): 100Hz-10Khz 
Distance Bluetooth stays connected: 10m Music 
Play Time : 15+ Hours ( 30 hours on half volume ) 
Charging time :About 2 hours