Your better off using warm water. It takes forever to get any warmth and the little warmth you get dissipates far too quickly. Warm water works better because it'll heat the whole thing rather than just the insertion area.

Bought this for my collection of fleshlights. It's exactly what I've been waiting for - superb to add some heat in to the equation, don't feel like I'm banging a corpse anymore!

Best accessory for my fleshlight flight. Comes with a mains (euro type) adapter for the USB cable, but to be fair to Bondara, the box is factory sealed by the manufacturer and retailer would not of known this. I've tried it and it really does make the fleshlight feel like the real thing. Due to the amount of current this product needs, I would use the mains adapter rather than a usb port from a laptop. I would personally stay clear from the cheapo hole warmers from ebay as they are not subject to the American/British safety standards and may overheat.