The Garmin Edge 705 GPS with HRM and Topo GB DVD is a unique GPS-enhanced cycle computer that provides extensive and accurate data to make this an invaluable training partner. Completely wireless operation making installation easy. Uses a high-sensitivity SiRF GPS receiver to track your movements. Virtual Partner lets you race against a virtual competitor or against yourself when repeating a route. Includes Garmin Training Centre software for post-ride analysis or workout planning. The large screen can be backlit at night for easy viewing and customised to show the data you want which uses a rechargeable li-polymer battery providing up to 15 hours operation. Unit dimension (cm) WxHxD: 5.1x10.9x2.5. Weight: 104.9g. Heart Rate monitor uses robust ANT wireless technology for superior battery life and minimal interference. The package includes TOPO GB DVD which contains topographic maps with detailed coverage of England/Scotland and Wales perfect for your next recreational outing. Displays detailed contours/trig points/geographic points. Using your PC you can select detailed maps tailored to your next trip and download map data directly to your compatible Garmin GPS.