PRODUCT GRADING (Grade A) -Excellent Condition > Minor if any signs of use and wear > Refurbished to the highest standards. Retail Box  WHAT IS IN THE BOX Kerui W18 Only 2.4G WIFI+GSM Wireless Smart Burglar Security Alarm System DIY Kit PRODUCT DESCRIPTION WORKS ON 2.4GHz WiFi (NOT support for 5GHz WiFi), by using the free iOS/Android \"W18\" app to search your WiFi signal and enter its password, you can control the system from anywhere anytime via your smartphone, and receive push notifications alert when you are out. Arm, Disarm, Home Arm, Delay Arm, Scheduled Alarm Time, Zone Attribute Setting and more can be adjusted on the app. SEARCH FOR ✔\"The way of using W18 Home Alarm system kit\"✔on YouTube to see more information. GSM Settings WORKS WITH A STANDARD GSM SIM card with credit (NOT provided). When the alarm is activated, UP TO 6 PRESET numbers will receive an alert telephone call and SMS text to notify you which zone has a security breach, and provides the 2-way intercom to check the panel status remotely. Supports O2, Vodafone and T-mobile Pay as You Go SIM card, or any other backward compatible 4G SIM card operates at GSM 850/900/1800/1900MHz. Complete Alarm System Comes with 2 PIR motion detectors, 5 door/window contacts, 2 key fobs and 1 indoor siren, already pre-programmed and all batteries installed so it is ready to work; can use both GSM and Wi-Fi together, back each other up in case one connection is interrupted; internal rechargeable battery allows the alarm to run if power fails UP TO 6 hours; main panel can be paired with 150 various sensors (Max), suitable for garage, apartment, shed, shop, house and business office. Loud Alarm Children and seniors at home in emergency, press the emergency alarm button of the remote controller, which will trigger all alarms and send emergency calls and messages to other families, so they can get help in time. The loudness of the external alarm is UP TO 110db. Support 6 groups preset alarm phone number, if alarm occurs, the host will dial preset number automatically and 10 seconds help voice recording. Wireless Alarm FREE MOBILE APP: By inserting a regular-sized GSM SIM card with credit (Not included), you can easily control the system via the \"W18 Alarm System\" app from anywhere in the world. Arm, Disarm, Home Arm, Delay Arm, Scheduled Alarm Time, Alarm Phone Numbers, Alarm SMS Numbers, Zone Attribute Setting and more can be adjusted on the W18 App. Free and available for iOS and Android smartphones.SEARCH FOR \"Kerui G18/W18\" on YouTube to see more. PRODUCT INFORMATION Manufacturer ‎- KERUI Part Number - ‎KERUI-W18 Package Dimensions ‎- 22.7 x 14.1 x 10.8 cm; 1.01 Kilograms Batteries ‎- 12 AAA batteries required. (included) Manufacturer reference - ‎KERUI-W18 Size - ‎W18 WIFI Alarm System Kit Item Package Quantity - ‎1 Sound level ‎- 120 dB Battery Cell Type - ‎Alkaline Item Weight ‎- 1.01 kg