Functions and features: 1) Various sensor types for options to suitable for different merchandise display. 2) Super mini appearance design, LED indication function to show work condition of every defense area. 3) Built-in diposable lithium battery with 1 year standby time in maximum. 4) Alarm will be triggered when alarm unit is detached. 5) Offer power switch. Main parameters: 1) Size: 45 x 20 x 15mm. 2) Case: ABS. 3) Sensor type: ES502, ES503, ES505, ES520, ES50 etc. 4) Alarm volume: 90DB. 5) Standby time of built-in disposable lithium battery: 1 year. For more functions and accessories, kindly please contact our sales or local distributor.