This product is invisible to the naked human eye. You need a special camera or night vision goggles to see.
Strobon Standalone is a good navigation strobe solution for enclosed drones like DJI Phantom, DJI Inspire, 3DR Solo, Walkera and others. No cabling required. Just attacth it to your drone or model airplane with your favorite glue or velcro, press the button to turn it ON. That's all.
Notice: The battery includes it's own PCM module. This module protects the battery from overcharge and discharge for long lifespan. If there is no life sign on the circuit when you press the button, probably discharge protection has activated because of low battery voltage. Just charge it.