"Introduce the rider you are today to the one you'll be tomorrow. The Garmin Edge 540 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 positional accuracy under dense tree cover as well as in the urban canyon, thanks to multi-band GNSS technology; the button controls work unfailingly in any conditions. 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: 2.8 oz. Offers targeted adaptive coaching Use with power meter and heart rate monitor Provides power targets plus stamina insights Multi-band GNSS technology Reliable positioning in all areas and conditions Great for goal-setting"