I've used Photon lights on my key chain for years and love them. I've given them as presents to many. However, I just purchased two of your newest models and don't like them at all. They have no on/off switch, but rather stay on with the first squeeze. That is fine. But they turn off automatically after ten to fifteen seconds. That drives me bats when I am trying to use it as a work light or read a menu. My next purchase will be for your original model that turns on only when squeezed or when the switch is turned on.