1. Low power consumption, suitable for battery-powered 8-channel GSM alarm module2. The 3G version is compatible with 2G networks and can be used in the United States, Australia, Europe, Chile, Singapore and other countries.3. This product can be powered by DC power supply or by battery (the battery is not included in the product package)4. Eight-way alarm detection, each alarm SMS user can set different content by himself5. You can choose the input port as NC or NO mode alarm6. Up to 6 groups of called numbers can be set. When the alarm input has a trigger signal, an alarm message will be sent to the alarm number, or the alarm will be called directly7. Application scenarios: mainly home security, warehouse security protection, remote monitoring of industrial standby status, remote unmanned sites, security protection (connection to various switch signal output sensors such as human detection, smoke, fire, water level monitoring, and gas)8. Support low battery alarm9. Support sleep power saving10. Working voltage: DC5V-DC15VSpecification: Package Weight One Package Weight 0.25kgs / 0.56lb One Package Size 15cm * 12cm * 3cm / 5.91inch * 4.72inch * 1.18inch Qty per Carton 118 Carton Weight 30.00kgs / 66.14lb Carton Size 50cm * 50cm * 60cm / 19.69inch * 19.69inch * 23.62inch Loading Container 20GP: 177 cartons * 118 pcs = 20886 pcs40HQ: 412 cartons * 118 pcs = 48616 pcs