Specification:
Size: 120 x 30 x 120 (MM)
Weight: 135G
Package: Neck Cooler, Parts X 2pcs, Manual 
Power Source: USB Power (No Battery Inside)
Cable Type: USB Cable
Function: Estimated10~15 Lower Comparing With Room Temperature 
Function Timing: (5000mAh: 5hours), (10,000mAh: 10hours), (20000mAh: 20hours)
**Depend on your power bank and your real time environment**
 
Concerns:
Difference environment will create certain difference result 
Plesae dont use too cool and may be huarmful to your body
Long time cooling may create heart at the end from the core of machine, please concerns the termperature variation when using.
Our recommand using not more than 2 hours
Please dont let it under the shock 
Please take off the USB cable when you are not using, not time connection may create the heat  inside from the machine
Please dont disasemble it by yourself