USB rechargeable hand warmers NToto!

Hand warmers
Rechargeable
Heating temperature: 40 ℃
Double-sided heating
Working hours: 2-4 hours
Charging time:
* Mini USB port: 2 hours
Ignition Method: ON / OFF switch
Power:
* Lithium-ion battery: 1,250 mAh
Color: Black, Silver
Dimensions (L x W x D): 4 x 9 x 0.85 cm
Weight: 45 g