These USB DC powered pair of heating pads are perfect for near-body heating applications. They get warm to the touch but not too hot as long as you provide the appropriate voltage. Simply apply USB or 5VDC to the wire leads and within minutes, the pad will begin to warm up.

The fact that these are low power, flexible and draw little power makes them ideal for things like hand-warmers and other heated garments. Maybe hook up a microcontroller and some sensors and make your own local climate-controlled.

Plug and Play easy to use pair of heating film with double usb cable. you can put it in light warming applications such as shoes, Gloves, Mouse Pad, warm blanket, incubators.

Features

• Voltage supply: usb – 5 VDC
• Maximum surface temperature: 40: 45 °C
• Size: 2 pieces 5cm x 4 cm
• Size: 2 pieces 5cm x 4 cm

Pack includes:

• 2 pieces x usb heater
• USB cable splitter (double jack)

Heating Pad Hand Warmer Blanket sparkfun tutorial.