Two used The LiftMaster 971LM Security+ Gate Garage Door Opener Remote Control Transmitter is a high-quality remote control designed for various garage door opener brands such as Merik, Master Mechanic, Craftsman, and more. With an operating range of 100 ft and a frequency of 390 MHz, this battery-operated remote transmitter ensures reliable and convenient access to your garage. Made of durable plastic and backed by a 1-year manufacturer warranty, this LiftMaster remote is a reliable and efficient solution for your home improvement needs. Pulled from working system.