Fangrui Product Details 1. F622-108 Electro Guard Watch Ir Remote Detection System Wireless Doorbell(white) 2. Place The Correct Batteries In The Detector & In The Receiver Units 3. Make Sure That The Batteries Have Been Put In The Proper Positions 4. Mount The Detector Properly By The Front Door, Window Frame, Driveway, Walk Path, Backyard Or Anywhere You Need. 5. Then Switch On The Receiver And Adjust The Volume To Either Hi Or Lo Position 6. Now The Remote Detective System Is Operating With The Infrared Detector Technology 7. Place The Receiver In An Easy To Reach Place 8. When The Detector Senses Motion, The Receiver Will Make An Audible Sound & The Led Light Will Flash 9. Please Wait For 30 Seconds After Switching On Detective & Receiver To Activate 10. Please Install Both Units 3 Feet Above Ground Level For Optimal Performance 11. Wireless Detector Size: 89.52 X 62.02 X 48.5 Cm 12. Receiver Size: 92.19 X 67.5 X 37.46cm 13. Wireless Detector Outdoor: Requires 9v Heavy Duty Battery. 14. - Infrared Motion Detection Reaches Maximum 400ft. Obstacles In Fornt May Shorten And Narrow The Coverage 15. - Switch Insidei Unit For On Off Must Switch On After Installing Batteries 16. Receiver Indoor: 17. - Requires 2xaa Batteries 18. - Hilo Switch For Adjusting Volume 19. - Mounting Bracket On Back 20. - When Signals Received, Lcd Indicator Will Flash & A Built In Speaker Will Give Out Beeping Sound