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

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.434 / Virus Database: 243 - Release Date: 12/25/02
 


VICUG-L is the Visually Impaired Computer User Group List.
To join or leave the list, send a message to
[log in to unmask]  In the body of the message, simply type
"subscribe vicug-l" or "unsubscribe vicug-l" without the quotations.
 VICUG-L is archived on the World Wide Web at
http://maelstrom.stjohns.edu/archives/vicug-l.html