The Ledlenser K6R Safety Keyring is an ultra-compact yet powerful keychain light with up to 400 lumens which also includes a shrill alarm for emergency situations and can help deter an attacker or serves as a loud call for help. It has 4 modes:

Always within reach, a carabiner lets you easily attach to keyring, backpack or purse. A transport lock protects against unintentional switching on. Its foldout USB-A connection allows for reliable charging which is quick and easy to use, no additional cables required. A charge level indicator shows you how much battery life is available.