Features:Infrared sensor alarm. When people get close to the alarm， it will detect the signal and activate the alarm.Insert the SIM card into the device for controlling. (GSM SIM card is recommended)Adopts advanced wireless communication technology.Audio monitoring， clear voice. After binding this device with your phone， it will call you When it alarms.Positioning. You can send message "DW" to SIM card number， and if the alarm is Moved， it can send you its new address to you.Remote control. You can turn on or turn off its sensing function by sending message to its SIM card number.Mini size and ultra lightweight.Simple-operation， stable performance and easy installation.Low power consumption， long standby time and accurate alarming.Suitable for use in home， children's bedroom， office， hospital， car， storage， etc. Specifications:Color: blackSensitivity: 5-8m / 16-26ft (center angle: 90 degrees)Standby current: <0.05mAWorking current: <10mAOperating frequency: 850MHz， 900MHz， 1800MHz， 1900MHzPower Supplied by: power adapter (EU plug)Alarm size: 4.7 * 3.2 * 1.5cm / 1.8 * 1.2 * 0.6inAlarm weight: 25g / 0.8ozPackage size: 12.7 * 10.6 * 3.4cm / 5 * 4.1 * 1.3inPackage weight: 135g / 0.3oz Packing list:1 * Alarm1 * USB cable1 * User manual