Mixca&reg; Digital LCD Pedometer Run Walking Distance Watchband Bracelet Fitness Trackers (Black ) Function: step counter, distance & calorie calculation Auto detect waist movement while running This fabulous pedometer step counter is durable and useful for a long time. Portable and stylish design is energy-saving and eco-friendly. It's helpful to your exercising. Low battery consumption and Auto Sleep;Power by: 1x button cell (battery included) Size: approx. 4.5 x 3.4 x 2.2cm;Material: ABS+Silica gel