<p>Product Features: Brand:  Dimensions: 2.8x1.5x0.6". Battery Type: 3 LR44 batteries included. Standby time: 1 year. Battery life: 50 minutes continuously. Brightness: 90 LED lumens. Contents: 1 personal alarm clock 1 carabiner. You can easily hang it on a key or bag. Heavy Duty - Our self-defense alarm is suitable for everyday life of all ages, such as students, the elderly, children, women, night shift workers, etc. Integrated LED Light: Also provides an extremely bright strobe light that is activated at the press of a button. The SOS light alarm keychain is designed for you and your loved ones. An attacker's worst enemy is attention. This 130dB alarm siren with SOS light helps attract attention and deter attackers in emergency situations. Please note: 1. The security siren is very loud, please do not put it on your ears. 2. If the security alarm is silent, please remove the screws from the back cover and replace the new batteries.</p><p>Note: The data is manual measurement, please allow an error of 1- 66cm, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.</p>