This is the same light as the Ultrafire 502B (with different branding), its more sought after than the 501B and this is the best price I have seen on either of them ever.
Type: LED Flashlights
Power Source: Battery
Battery Type: 1 x 18650(Not Include)
Emitter: Cree XM-L T6
Voltage(V): DC3.7
Total Emitters: 1
Range(m): 180
Brightness(Lumen): 800
Lamp Life-span(hrs): 100000
Runtime(Hr.): 2-5
Waterproof: IP67
Switch Mode: 5(High > Mid > Low > Strobe > SOS)
Body Color: Black
Body Material: Aluminum alloy
Dimension(cm): 13.6 x 3.4 x 3.4
Certification: CE
Package Contents:
-Flashlight
-Clip
These things are so cool I bought 2. Much cheaper on Banggood when they are on special (under AUD$10) and even included a charger and 18650 battery.