{"product_id":"mrt-transponder-for-ambrc-rc4-v4-4-stormer-hobbies","title":"MRT Transponder for AMBrc\/RC4 (v4.4) | Stormer Hobbies","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe MRT Transponder from MRT is designed for AMBrc and RC4 timing systems, offering a lightweight, compact solution that fits neatly into tight spaces inside your RC car. Stormer Hobbies uses these transponders personally, so you can trust their reliability across practice sessions and league events.\u003c\/p\u003e\u003cp\u003eWith a 100% waterproof construction and a weight of just 4 grams, this transponder disappears inside chassis and bodywork while maintaining solid performance under race-day conditions. Its footprint measures 19 x 16 x 6 mm, ensuring it stays out of the way during maintenance and setup.\u003c\/p\u003e\u003ch3\u003eKey specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSize: 19 x 16 x 6 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 4 g\u003c\/li\u003e\n\u003cli\u003eLead length: about 190 mm from Stormer Hobbies\u003c\/li\u003e\n\u003cli\u003eOperating voltage: 2.1 V - 16 V DC\u003c\/li\u003e\n\u003cli\u003eMounting: Standard 3-Hole (same as AMB\/MyLaps)\u003c\/li\u003e\n\u003cli\u003ePTX transponders ship with two stored IDs and come factory set on the custom ID with an alternative number available\u003c\/li\u003e\n\u003cli\u003eLED indicator shows the transponder status during operation\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor user setup, the LED lights up when the transponder is powered. When you set or verify the ID, the LED flashes to indicate the selected number, giving clear on-board feedback.\u003c\/p\u003e\u003ch3\u003eSystem compatibility\u003c\/h3\u003e\u003cp\u003eThe MRT Transponder works with AMBrc2, AMBrc3, and RC4 systems up to version 4.4. It will not operate with the v4.5 Drone System update.\u003c\/p\u003e\u003ch3\u003eReal-world use cases\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits into small, cramped areas in many RC models from brands like Associated, Xray, Losi, CRC, and Serpent\u003c\/li\u003e\n\u003cli\u003eTwo stored IDs let you run multiple setups without swapping hardware; switch IDs as needed for different events or cars\u003c\/li\u003e\n\u003cli\u003eLED feedback provides quick, reliable checks that the unit is powered and the selected ID is active\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRacers and hobbyists around the world rely on MRT transponders for consistent timing on AMBrc\/RC4 systems, especially when space is limited or you’re outfitting a mixed fleet of cars. The 190 mm lead keeps the transponder accessible without stressing connectors, while the waterproof design helps on wet tracks or splashy pit days.\u003c\/p\u003e\u003ch3\u003eWhy choose MRT transponders?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eProven compatibility with a broad range of RC cars and timing systems\u003c\/li\u003e\n\u003cli\u003eSmall, lightweight form minimizes aerodynamic and weight impact\u003c\/li\u003e\n\u003cli\u003eTwo IDs provide flexibility across different setups\u003c\/li\u003e\n\u003cli\u003eClear LED status supports simple setup and on-track checks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which systems does the MRT Transponder support?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Compatible with AMBrc2, AMBrc3, and RC4 up to v4.4; not compatible with the v4.5 Drone System update.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many IDs are stored and can I switch between them?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: PTX transponders ship with two stored IDs; factory default on the custom ID. You can switch between IDs using the LED indicator.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Stormer Hobbies","offers":[{"title":"Default Title","offer_id":46526503780551,"sku":"B07Q1WDMMD","price":131.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/2355\/7319\/files\/stormer-hobbies-mrt-transponder-compact-19x16x6mm.jpg?v=1778428891","url":"https:\/\/toyterrax.com\/products\/mrt-transponder-for-ambrc-rc4-v4-4-stormer-hobbies","provider":"ToyTerrax","version":"1.0","type":"link"}