This E01 Flashlight (Blue) from Fenix Flashlight is an ideal keychain flashlight--small, very light (less than an ounce), waterproof, and 13-lumen output. Made from aircraft-grade aluminum, this sturdy little flashlight (just 2.79" long) has a reliable twist switch, and can stand upright for use as a candle. The runtime on a single AAA battery (Ni-MH or Alkaline) is 21 hours and it has a range of approximately 68'/21 m. A key ring and a spare O-ring are included.
13-lumen LED output
21-hour runtime
Waterproof to 6.5'/2 m (IPX-8 standard)
Weighs less than one ounce without battery
Made of aircraft-grade aluminum
LED has 100,000-hour lifetime