Size is approx:

11.3 by 4.7 by 2.2cm

Pokemon protecting your children! Popular in Japan is the kidsPersonal Security Alarm, simple to use and effective!

Additional product info:
When you pull the main body of the buzzer, it makes a loud buzzing sound to warn others that you are in trouble and need help
– Buzzer volume: 85dB
– Comes with test batteries (two CR2032 types)