1.convenient to carry
2.preventing with arthritis auxiliary the headache lumbago.
3.kinds of style
4.good gift to friends

Specification:

1.Rechargeable Lithium Battery with up to 500 recharges
2.Temperature Settings 40°C to 50 °C
3.With low/high settings and use last for 3~6hrs,depend on the working environment
4.Warms on bottom side of unit
5.Charges via AC adaptor in 1~2 hours
*Can be fully recharged in approximately 1~2hours                    

Feature
1) operated by usb line or AC charging or recharger battery
2)It is convenient to carry.
3)has the obvious fuction in preventing with arthritis auxiliary the headache lumbago.
4)assemble the power line yourself
5)kinds of style for your choose.
6)a good gift to your friend