wireless strobe sirenWireless Indoor Siren 1. Functions Features:1.1 Works with alarm host,Website: , wireless receiving alarm signals, spot alarm with sound and flash 1.2 With power plug, usually for indoor use.2. Specifications:2.1 Operating Power: 100 - 240VAC 2.2 Receiving Distance:  100M In open area  3. Installation and Usage: 3.1 Plug the wireless siren into suitable indoor power socket 3.2 Recommended to install around 1.8M high from the ground 4. How to add/delete to/from alarm hostA. To add 4.1 After connecting to the power, press the   Study Button   on the side of the siren, siren lights on4.2 Press study key on the alarm host, then disarm by host keypad (ESC + programming password + 'ENT' , the alarm host beeps 'Di Di', to indicate successful disarm) after 5 seconds.4.3 Light on the siren flashes 5 times and then off indicates successful adding.B. To delete4.1 After connecting to the power, keep pressing the 'Study Button' on the side of the siren for 5 seconds and release, light on the siren flashes 1 time and then off indicates successful deleting.Notes: 1.You can only add 1 wireless siren each time.2.To add wireless siren, you can only operation on host inbuilt keypad. 3.One wireless siren can be added to at most 10 wireless alarm hosts, multi wireless sirens can be added to one alarm host.