WW Astro 40cm dew heater strap designed for a 4" telescope. Works with USB power bank and produces 7.5W of power. Comes with 2m silicone cable. Made with simple design, but good quality materials and finishing. Its main advantage is its low power consumption - a dew controller is not required. However, it is compatible with popular controllers (may require USB/RCA adapter). Easily wrapped and held in place with a stretch velcro tab. USB connection
Note: OTA size is estimated. Please check your OTA circumference before buying.