... far away,penetrating cusion/wall,use battery wireless key finder,remote finder,good finder,key locator,locate things up to 30M far away ... Set Inlcudes:1pcs Remote Transmitter + 2pcs Receiver(with accessories: key ring+adhesive sponge)•Remote Transmitter Size:56*30*12MM•Receiver ... Remote with 1 or 2 or 4 Receivers. Supply Wireless Key Finder Locator Up To 30M Remote Distance Can Penetrate Wall/Cusion