Security alarm that protects your safety with a 90dB volume, activated by pulling a cord, and the battery is easily replaceable. Set of 2. Brand new, unused, stored at home. I bought a lot of these to attach to school bags, bags for cram school, etc., but I have some left over. - Color: Pink - Color: Blue - Volume: 90dB - How to use: Activated by pulling a cord - Battery replacement: Easy to replace Thank you for looking.