KERUI W193 WiFi 3g gsm Smart Home Security Burglar Alarm System DIY Basic Kit Auto Dial Alert,Expandable Up to 99 Intrusion Sensors/Remote Keyfobs,24/7/365 Monitoring No Monthly Fee MAIN FUNCTION: W193, 3g gsm/PSTN/wifi function security alarm system, to use standard size (not micro and nano) 3g gsm (cellularnetwork) sim card or ASDL landline(not optical fiber or internet landline) to call/text up to 6 preset phone numbers; to let you use app to remote control it over wifi conveniently. 3ggsm(cellularnetwork)supportiscritical as 2g will be no longer available in the USA in 2019 while AT&T has already shut off 2g service in 2017. Wifi must be 2.4G not 5G. APP CONTROL: Wifi: First download app(search "W19 alarm system" at google or iphone app store) free and register an account,insert a sim card to W193 alarm keypad,you can remote control the 3g gsm alarm security system over wifi via APP on your smart phone from anywhere at anytime. Sim card: In case wifi is disconnected, W193 will automatically change to use sim card function to let you remote control it by sending message no matter where you are, just make sure that there is sim card in it. BRIEF INTRODUCTION: W193 is the most functional and newest basic security alarm system kit with fully programmable main unit and sensors, can be used directly after unplugging insulation sheet to protect home,office,business. DIY supportable 99 wireless zones, up to 150 remote key fobs and 150 sensors,add more sensors as detailed need such as gas detector,water leak sensor to provide all-around reliable protection.Additional Sensors can be find in our shop or we can customize the kits for you. HUMANIZATION DESIGN: Built with 2.4 large LCD display and humanized design such as camera supportable, illegal arm, multiple controls for APP etc.. W193 alarm panel has a built-in 3.7V 800mAh rechargeable lithium battery which generally can last about 6-8 hours, it will automatically change to use battery to power in the case of power failure. Wired sensor connection supportable. CUSTOMER SERVICE: 12-month warranty, technical support and friendly responsive customer service within 24 hours. Professional team to serve for you, if you have any questions, welcome to contact us via amazon emails, we will try our best to help you.