This alarm is made of ABS with 130 DB, you just need pull the ring out, the loudly sounds can draw people's attention even in a far distance, it could help you call for assistance in an emergency and helps deter attacker. By press the small button on side, it then turned out to be a LED light that provide illumination in the dark. The key chain designed for hang on your backpack or handbag as a decoration. For the logo, laser engraved is the best choice.