It turns out that trying to include a waterproof on/off button in our fully epoxy potted bike lights posed some interesting challenges. But few thing will phase us, and after a lot of work we've managed to sort through all the challenges and are re-introducing the button LED lights by the end of this week. The rear light is now slightly larger and brighter with 8 LEDs, and both the front and rear lights feature onboard memory as well. When the light is powered off, it remembers what mode it was in (on, off, or flashing) and returns to that state when power is re-applied. Pressing the button then cycles through each of the modes.