This is a security alarm, perfect for peace of mind when starting school or kindergarten. 【Includes Japanese instruction manual.】 Features an LED light for safety on dark roads. Product Name: Personal Alarm AJ-9400 Size: Diameter: Approximately 9.2cm (pin retracted) Thickness: Approximately 2cm Maximum Width: Approximately 3cm Batteries: AAA alkaline batteries x 2 (test batteries included) - Color: Baby Blue - Volume: 130dB ★Regarding product comments and purchase handling: ・We apologize, but we will only respond to inquiries and process purchases on weekdays until 3 PM. ・We are unable to respond on weekends and holidays. ・Please understand that there may be delays in our responses and shipping.