All four units are brand new and unused. One unit does not have a box (SE-105BS). All are waterproof and have a loud 95dB alarm. These are security buzzers with LED lights and straps. They come with a strap to hang around the neck, suitable for: - Adults to wear around their necks - Children to attach to their backpacks or school bags - Colors: Yellow, Gray - Included: Strap - Features: Equipped with LED light Thank you for viewing.