Personal Security Alarm, a Perfect Back to School Gift for Your Kids: Pull the keychain or double click the SOS button, then the panic alarm will emit a 130dB sound with LED flashlight, loud enough to attract attention and scare off attackers USB Battery: The alarm is made of rechargeable lithium battery, no need to replace the battery. Use the cable directly via USB data port for charging, convenient and reusable. IP44 Waterproof Material: This security alarm is made of IP44 waterproof material, which means it is protected from splashing water from all directions, providing excellent protection even in rainy days. Bright LED Light: The bright LED light not only can be used as a flashlight, provides light in the darkness, but also powerfully accompanies the siren to attract more attention and blind attackers. Convenient to carry, practical in use and stylish in appearance, this small alarm keychain is easy to carry on your purse, school bag, handbag, keychain or pocket. Great personal