Specification:

1) Completely hassle free - no more booting up your notebook to find a Wi-Fi signal
2) Detects most available Wi-Fi networks with the press of a button 
3) Four lights indicate signal strength, Tell you how strong the wireless Internet
access signal is.
4) Compact and light weight - fits in your pocket.
5) No software or computer required and the pocket-sized, refined design is compact
and light weight.
6) Operating voltage: 3V, 2pcs AG13 batteries
7) Operating range: 100 - 200m (open space), 25 - 50m (indoor)
8) Temperature range: 0 - 60°C (operating), -20 - 75°C (storing)
9) Antenna: on the back casing, do not block it when detector
is during operation