Great that no batteries are needed . Just charge on the mini charging cable included with your own Apple charger. Easy to deploy and comes on a key chain for convenience to attach to belt loop or bag or general keychain . The mini inbuilt flashing torch is also very handy back up . This seems to be a well constructed alarm compared to others on the market . Discounts offered for multi buys . The sound is very loud so it’s a great item to carry for self defence or attracting attention in a situation if needed . Big thumbs up . Would highly recommend to anyone needing extra security when out and about .