Note: This product is to work with the Ring Doorbell Pro version only. Features: *Four angle choices optional, angles available for 20/ 30/ 40/ 50(20+ 30Combined). *It can provide more choices and more angles available, so you can get a better view of visitors coming to your door. *Specifically designed to work with the Ring Doorbell Pro version only. *Perfect design---All screw holes are well designed and fit the high quality stainless steel screw perfectly.(Equipped with one more for each kind of screws in case of loss in installation.) *Good quality and easy for installation. Specifications: For Video Doorbell: For Ring Pro ONLY Angles available: 20/ 30/ 40/ 50(20+ 30Combined). Material:PC Color: Black Item Size(20):11.3*4.8*2cm Item Size(30):11.3*5.3*3cm Item Size(40):11.3*5.5*4cm Item weight(20):23g Item weight(30):30g Item weight(40):35g Package Information: Package Size: Approx.12.1*6*6cm/4.76*2.36*2.36in Package Weight: Approx.129g/4.55oz Package List: 1* Bracket(20) 1* Bracket(30) 1* Bracket(40) 1 * Bag of Mounting Screws 1* User manual (English)