W&W Astro dew heater 15 cm strap is designed to fit 2” eyepiece or finderscope. Works with 12V power supply and produces 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. Note! The OTA size is only estimated. Please check your OTA circumference before buying.