AutoPage RF 255A Security System with Two Transmiters Two, Mini 5 button High Frequency (433.92 MHz) Remote Transmitters On-Board 2-Stage Electro-Magnetic Shock Sensor with Sensitivity Adjustment via Remote Control Programmable Alarm Mode or Keyless Entry Mode. Dedicated Chirp Delete from Remote. Dual Stage Shock Sensor 56 Bit Random Code Hopping. Over 75 trillion available codes. Programmable Alarm Mode and Keyless Entry Modes. Reliable Performance backed by Auto Page 35 Year History. Limited Lifetime Warranty.