Top Rated by Aviation Consumer Magazine No one sells more PCAS in Canada than PCAS.ca. We carry only current stock with the latest firmware. MRX-A: Tiny and Affordable. NEW VERSION - Now featuring voice prompts in your headset and a sleek new look. PCAS MRX, the smallest, lowest cost collision avoidance system ever created, all with proven digital technology and accuracy. MRX delivers accurate range and relative altitude in a package the size of a deck of cards. It's even portable and works for up to 8 hrs on 2 AA (NiMH) batteries. MRX displays range and relative altitude of the closest threat, with continuous monitoring of the top 10 threats within the 5 NM scalable detection window. Altitude detection is scalable up to +/- 2500 ft. At 2.5" (65mm) W x 4.2" (107mm) D x 0.6" (17mm) H, MRX is smaller than a deck of cards. MRX uses an easy menu-driven interface and audio annunciations for traffic advisories and alerts. The unit boasts a built in solid-state altimeter for "always relative" altitude information, and built-in temperature compensators and overtemp protection. Information is displayed on the high-brightness LED display (dimmable). MRX also monitors aircraft bus voltage and host transponder output. The unit is powered by aircraft power (12-40 VDC adapter included) or 2 "AA" Batteries. MRX is half the size, 1/3 less price, portable and offers better accuracy and many more features than the ATD-300. "The walkaway winner as the top value. We recommend the MRX without reservation." - Aviation Consumer Zaon PCAS systems: the best portable collision avoidance systems on the planet. Why would you fly without it?