JTD luggage scale (Key Finder) Includes 3 receivers, one transmitter and key rings with a 75-130 feet range. The loud beeping sound on the the receiver will lead you to your lost item Low consumption and long standby time with stable frequency technique.Wireless search that easily penetrates though walls, cushions and doors with a push of a button. Free lifetime technical support from the manufacture and free 1 Year Manufacturer Warranty from JTD WARNING: This item contains small parts. Please keep it away from young children. Other Tips: Rotate battery cover to ''ON" position to remove the cover, and rotate to "OFF" position to latch the cover.