The Rapid L1 is an excellent choice if you prefer a compact, single battery light that won't break the bank. In addition to constant on, the tail cap also offers a momentary on function as well as three modes which are selected by tapping on the switch (High - default, Low - two taps, Strobe - three taps). With a good blend of size, brightness and runtime, this flashlight will be in your pocket and ready to go when you need it. This product cannot ship air so please allow a few extra days for delivery.