"Introduce the rider you are today to the one you'll be tomorrow. The Garmin Edge 840 GPS Cycling Computer offers targeted adaptive coaching when used with your compatible power meter and heart rate monitor. This handheld unit helps you manage your efforts by providing power targets throughout a course plus stamina insights, so you know how much gas is left in the tank. Get superior accuracy under dense tree cover or the urban canyon, thanks to multi-band GNSS technology. It features button controls that work in any environment matched with a responsive touchscreen so you can tap, pan, and swipe on the fly. Whether you're riding roads, trails, gravel or indoor, you can benefit from insights and workouts that will help you understand your strengths and weaknesses and prepare for upcoming races or personal milestones. 2.3"" x 3.4"". Weight: 2.9 oz. Offers targeted adaptive coaching Use with power meter and heart rate monitor Responsive touchscreen: tap, pan, and swipe on the fly Provides power targets plus stamina insights Multi-band GNSS technology Reliable positioning in all areas and conditions Great for goal-setting"