Come and see our amazing products. The keychain of the Blind Personal Alarm and Rescue Device is made of plastic. Its surface is convex, which can be used conveniently by the blind. The emergency alarm can make a loud sound to attract attention, and can protect you from emergency situations even at a distance of 606.9 feet. In addition, the sound can continue for 50 minutes of continuous ear-piercing alarm. They can be used for up to 365 days before you need to consider replacing them. With LED lights, the emergency alarm can be used for night lighting, suitable for people of all ages, such as students, the elderly, children, women, and night shift workers. Its size is approximately 3.15x2.17x1.18 inches. We welcome customized logos, please contact us. Pls confirm with us about the packing info, stock color and exact production time before placing your order.