Afraid of being tracked by strangers. Let this security alarms protect you. Small but powerful with keychain, which makes it portable and easier to carry everywhere. Perfect self defense with led light when you are walking at the dark street with loud screaming sound. Of course there are other shapes of security alarms. If you needed, contact me first please. Your own business logo is available on it. Attention to the quantity, if it is over 30000, it would be shipped by ocean. Be online at any times and looking forward to your messages.