Anti-Lost Small Key Finder

This convenient gadget will beep the right device every time. Simply press the button on the radio transmitter to find an item up to 60 feet away. The transmitter's radio frequency penetrates through walls, cushions, and more, so the receivers will beep whether they are in another room or lost deep under the couch. Now you never have to worry about losing your keys, wallet, or remote controls! 
Features
RF wireless remote control electronic key finder, which is environmental and have no radiation.
Helps you find your keys, purse and mp3 easily.
Long battery service time and working distance
With key rings for convenience and portability
Both receiver and transmitter are light and small, and easy to carry around and operate.
Specifications:
Frequency:433.92 MHz
Sound Volume of Receiver:85dB
Operating Distance:20m indoor, 20~30m in open space
Transmitter:
Weight:1.5oz/43g
Battery: 23A alkaline 12V(included)
Receiver:
Size: 5.2X3.2X1.3cm/2.05*1.26*0.43 inch
Weight:0.4oz/12g(with battery)
Battery: CR2032(included)
Package Includes: 
1X Transmitter
5X Receiver (five different colors)
1X Plastic Bracket
1X English Manual