I've been waiting for you, Nitecore Multi-Task Series MT20A
Designed and built to thrive in the most extreme conditions on Earth, MT20A uses 2xAA batteries as power supply, which means that it comes highly compact to free you from bulky charging devices or backup batteries as you can obtain this type of batteries very easily on the go.
Featuring tactical tailcap switch, MT20A possesses significant ergonomic advantages. Applying thumb pressure in a natural gripping action turns the light on; releasing thumb pressure turns the light off: crucial in combat and law enforcement. With the light turned on, pressing the side-switches brings you different outputs and special modes such as red light illumination.
You'll find that Nitecore New MT series meet your needs and exceed your expectations. Old but not obsolete.