ATTENTION:This device only support 2G SIM card, so only support GSM network, don't support 3G,4G SIM card and 3G,4G network. Before you place an order, please make sure the company of your country support 2G SIM card, otherwise the device will not work. and high quality Easy to operate by one call or SMS Aluminum alloy case with fire retardant plastic to prevent fire Up to 5 different mobile phone numbers can be pre-set in the system Secure - Using caller ID for identification, unknown callers are ignored No need to provide a remote control for different users Can be operated from anywhere, no distance limit Can be used for authorized door access, controlling gates, switching of remote equipments, car parking systems Great for control of home electrical devices such as servicer, lamp, computer, refrigerator, TV, wireless router and so on Work frequency: 850/900/1800/1900MHz Input power: 0.9W Output current: 10A voltage: AC100-220V Max. output power: 2200W Weight: 290g Plug Type: US Plug, it applies to Canada, India, Japan, Mexico, Thailand, Taiwan, the , the Philippines and so on. colour:Silver Material:Aluminum alloy size:15.5*5.5*3.2cm Package Contents: 1 * CL4-GSM wireless controller 1 * US plug 1 * antenna Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.