Technical Parameters | Voltage | DC 5V | Stand-by Volume | <25mA | Alarm Volume | <450mA | Frequency | 433MHz | GSM Frequency | 850/900/1800/1900MHz | Backup Battery | Lithium Battery 3.7V/500mA | Alarm Loudness | 80dB | Host Size | 15.6cm x 9cm x 1.6cm | Host Weight | 128g | Host Base Size | 15cm x 10cm x 3.7cm | Infrared Size | 10.5cm x 6.5cm x 4.2cm | Magnetic Door Size | 7.5cm x 3.5cm x 1.3cm | Remote Control Size | 5.8cm x 3.5cm x 1.2cm | |