For anyone needing more range (100 feet) I found this somewhat less
affordable but seemingly well-designed model called Finderz Keeperz.
http://www.finderzkeyperz.com/product.html
Feature highlights:
100' / 30 meters effective operating range ensures successful locating: FCC
ID # NLHRT3310
Loud 85 dB beeper can be heard under furniture, in a closet and through
clothing
Extra-long 60 second beeping duration allows more than ample locating time
Super-bright sapphire blue ultra high-intensity 1750 mcd 100,000 hour led
personal flashlight with convenient hands-free on/off switch and two-minute
power-saving auto-shut-off circuitry
Rechargeable lithium ion batteries and custom smart charging ‘Mouse’ (see
photos)
Low-battery chirp provides ample advance recharge warning
System expandability; accommodates up to 50 units to one system
Choice of four distinct beeper patterns
Built-in retractable mini-antenna for extended range operation
One-million unique transmitting codes eliminates annoying false triggers
Protective sliding door hides buttons ensuring units will not sound
accidentally
Unique patent pending compact design is easy to operate
One-year limited manufacturer's warranty
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