410-450MHZ self-locking version of The Water Level Switch Two-way Feedback Automatic Controller Wireless Remote Control Switch - AliExpress
Generic 250-450 MHZ Handheld Digital Frequency Meter Counter Wireless Remote Control Tester Tools, Wireless Remote Control Detector Frequency Tester: Amazon.com: Tools & Home Improvement
250~450MHz Handheld Digital Frequency Meter Counter Wireless Remote Control Tester Tools: Amazon.com: Industrial & Scientific
Trimble R10 Remote UHF Radio Antenna 430-450Mhz 5dB | CSDS
250-450MHZ Car Key Frequency Detector Tester Counter Remote Control Checker RF | eBay
TINYSOME Handheld W1re1ess Remote Control Detector Counter Frequency Tester 250-450 MHZ - Walmart.com
250 450MHZ Frequency Reader Counter Car Radio Transmitter Frequency Counter Wireless Remote Control Apparatus Automotive Detector From Acartoolservice, $17.2 | DHgate.Com