Model MS-5 MICROSONIC™ Ultrasonic Pet Door Collar Electronic Fence Replacement Kits We applied sophisticated acoustical engineering

We applied sophisticated acoustical engineering to make it very quiet (< 40 dB) while opening and closing

And so do their pet parents

Also sold in 1-pack

auto safety retract and the ability of the collar to operate other pet activated devices

Model MS-5 MICROSONIC™ Ultrasonic Pet Door Collar Electronic Fence Replacement Kits We applied sophisticated acoustical engineeringSuper Advanced Technology, Value Pricing! The Gold Standard of Pet Electronics Technology Digital circuitry in this state of the art design provides a strong signal and maintains accuracy over all temperature ranges. It is extra rugged so it won't get damaged during your dog's "ruffhousing". With a robust, fully enclosed ultrasonic transducer speaker, it is immersible to 6ft., and although we don't recommend immersing your dog in 6 ft. of water