Features: this product uses high-tech PTC ceramic thermostat heater, electric strength 3750V/minutes does not penetrate, withstanding voltage 330V/3 minutes, the built-in safety fuse, use a more secure, configure the bronze wear the muzzle, high temperature resistant silicone sleeve, long service life, built-in safe, stable quality, feel good, user-friendly design, long-term sealing is not hurting hands