... Working Voltage:DC5V 5:Dimensions: 43*30mm rf machine Radio frequency with 315 or 433.92MHz wireless rf receiver module ... Technology Co.,Ltd is a professional manufacturer engaged in the alarm systems of research,development, production, sales and service. ... Our main products are Home PSTN/GSM Security Alarm System, 3G Alarm System, GSM Power Alarm, Video Monitoring system, Wireless Remote controller, ...