... ,etc wireless key finder,lost key locator,object finder,100 feet remote distance,beep & flash while calling,penetrate cusion/wall,etc ... strong anti-interference.Won't be triggered wrongly for drop or loud sound,power saved;•Easy to use,just press Transmitter ... things easily;•Portable,can be hung with keychain,or sticked with adhesive sponge or magnet. REMARKS:•Customer's Logo acceptable;•OEM acceptable ...