NATHAN Strobe Light 2.0

A clip-on LED light that is waterproof and lasts up to 110 hours and comes in a variety of colors.
Maximum illumination: 8 lumens
Water resistance: IPX4 (waterproof for daily use)
Battery-powered: 2 x 3V lithium-ion button cell batteries (CR2032)
Lighting blinking mode: 4
Approximate runtime (duration/illumination): All lights on 57 hours/8Lu, all flashing 110 hours/4Lu, alternating flashing 110 hours/2Lu, round flashing 110 hours/3Lu

To turn on the power, press and hold the power button for 2-3 seconds.
Press the power button again to switch modes.
To turn off the power, press and hold the power button for 2-3 seconds.