Set of 2 LED lights & security buzzers SE-205BS. Comes with a neck strap. Can also be attached to a school bag. 【Model Number】SE-205BS 【Volume】95db 【Waterproof】IPX5 【Batteries】2 AAA batteries (included) 【Size】85 x 50 x 28mm (thickness) 【Weight】61g (including batteries) 【Color】Yellow Although unused, please understand that this item has been stored at home before purchasing. Thank you.