BANDED H.E.A.T. (Heated-Element-Activation-Technology). Finally, electronic heated gear that works. Featuring 3-level adjusting heating element (High, Medium and Low Temperature) packed with 100-g of PrimaLoft premium insulation. *Batteries sold separately Sizes: M-2XL. Power on. To turn on the product, simply press and hold the heated power button for about 3 seconds. The light will glow red indicating that the power is on. To adjust the temperature setting, single press the power button to cycle through the corresponding LED lights. To turn off the product, press and hold down the power button for about 3 seconds and the LED light will then turn off. RED LED: High Temp ORANGE LED: Medium Temp GREEN LED: Low Temp