A updated gsm alarm systemsS3524A: take care of your child + monitor house. KingPigeon ltd GSM new alarm systems S3524A. Name: Intelligent GSM Alarm System Model: S3524A The S3524A is designed for house and office and other applications. It based on GSM Communication network and Lcd Menu display technology. When any sensor triggered, it will Call&Send SMS to user cellphones. Also, the Child Remote Control recognize function is our unique technology, When the Child press his remote control button, the mainframe will send a SMS “I’m leave home now” or “I’m come back home now” to his father or mother! The S3524A equips with LCD and Operation Menu Display, all operations and settings are visual and intuitive! What you need is a SIMCard which support Call ID function.