W&W Astro dew heater for secondary mirror on 2 inch stalk (large) . Works with 12V power supply and consumes 3W of power. Comes with 2m silicone cable. Made with simple design but astonishing good quality materials and finishing. It’s main advantage is low power consumption hence dew controller is not requited. Compatible with popular controllers. It’s made to be easy wrapped and hold in one place.