- “Tiny But Mighty!” – Don’t let this little light fool you, it may be small, but it makes a huge difference on the road. Let traffic know you are there and reduce the chance of an accident- BATTERIES INCLUDED - 2 x 3V Lithium 2032 – Replaceable Coin Style Battery- SUPER BRIGHT – Packed with 3 LEDs – this light cast 8 Lumens to help you stay safe- WATER RESISTANT – Built for all types of weather this strobe is IPX4 – Weather resistant so you can run, rain or shine.