Charge the battery for 4-5 hours.

Plug the battery into the garment securely.

Hold the button on the battery for approx. 3 seconds until the four LED lights on the battery turn on.

Control the heat level by again pressing the button on the battery. 4 LED lights = 100% heat, 3 LED lights = 75% heat, 2 LED lights = 50% heat, 1 LED light = 25% heat.

To turn off the heat, press and hold the button on the battery until the lights turn off.