Made of light plastic, it is elegant, small and exquisite
It can be taken with people as keyring or necklace button
Pull out the ring, it will make a sound of 120dB to deal with every emergency circumstances:
Tied with valuables, ring will be pulled out and then alarm when robbed
Female takes it, pulling out the ring when needed, alarming for help
Elders and children take it, alarming for help when sick or in danger
Self protection for jogger, elder, handicapped, traveller