130 Db 433mhz Wireless Magnetic Sensor Home Door & Window Input Burglar Alarm Security Alarm The product is shipped based on the color or size of the main image of the product page. "1.When the door is open, it will alarm for 30 seconds.Unlock button to stop the alarm. 2.Three sound settings: Ding Dong sound / alarm sound / beep sound 3.SOS button audible alarm for 30 seconds 4.Sound warning for battery voltage lower than 2.1V Alarm size: 90 * 43 * 13mm RC size: 60 * 33 * 11mm Magnetic tape size: 45 * 13 * 13mm Material: ABS MHZ: 433.92 MHZ Decibel: 130 dB RC distance: about 15 meters Alam battery: Replacebale 2pc AAA battery integrated in the alarm device Battery in RC Replacebale 1pc CR2032 battery built in RC device"