The bell is sound and gives a good ding when its hammered. The compass works and at first it seems to be backwards because the direction that is visible while riding shows the direction behind you and it takes a little getting used to. Features - Color: Red. - Material: metal. - Size: 7.60X6.20X4.50cm/2.99X2.44X1.77in - Made of material. - The product has warning compass function. - This is a specially designed for bicycles and simple electric vehicles. - Life rain prevention design, can be used outdoors in rainy days. - It is convenient to installation and use, functional and very practical. - Warm Tip: Dear buyer, Due to lighting effect,monitors brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand! Thank you! Package list: 1 x bike bell