Profile: Linear, LLC. is a manufacturer and distributor of electronic components. Our model PERS-2400B personal emergency reporting system is a supervised wireless emergency reporting product designed for medical alert applications. Our open-close-stop stationary transmitter is designed for commercial automatic door and gate operator applications & this transmitter can operate multiple receivers connected to multiple operators. Our residential telephone entry system is designed for light commercial access control applications and the speakerphone, keypad, radio receiver & optional video camera are housed in a rugged enclosure that can be mounted to a pedestal or bolted directly to a wall. Our supervised 4-channel digital receiver can be used in a variety of security and remote control applications.