Wireless electronic key finder, find keys by card. 1. RF technology 2. long distance:30-50m 3 ... wireless alarm Electronic key finder with LED lightIntroduction:Put the card in the wallet, and the receiver with keys , ... 't find it, just push a button on the card, and the receiver will sound alarm and LED flickering ... :CR2032 1pcPackage: blister cardAbout our factory: RF wireless card luggage/key finder