Hello and Welcome, NEEDS BATTERY You are viewing a barely used. Older model Vetta RT288 wireless bicycle computer. As far as I know, all of the parts are there, I took photos so hopefully you can determine that. This bicycle computer was only used a a couple of times on short trips, it worked perfectly then and I would be it would work now. Great design. Much better than the ones that go on your front fork. It will connect to most ANT + 2.4 GHz and Bluetooth devices. It's just the sensor. Not the computer. You will need your own computer or phone. It cost me $49.00 and I will include it along with all original packaging and accessories. All details of the bike are on the trek website. Trek is America's most trusted bicycle brand. As a Trek Concept Store we are able to offer you the best programs, pricing, training and service. We are held to higher standards to ensure you have a superior shopping experience with each visit. Trek Bicycle Store - Chattanooga also recommends Helping you plan for the unexpected. Giving you access to features and tools to enhance your daily life. From reservations and recommendations to routes and reroutes, we have the tools to help you stay on track and discover new adventures (to show that you can do both instead of one or the other). Trek Bicycle Boise wanted me to be 100% not just 95% happy with my bike. The whole team at the Boise store made me feel so special and sent me out the door with a bike I know I will love and with first hand knowledge that this beautiful new store is all about customer service!! It is the most important fact needed to setup the bike computer because the device senses each revolution of the tire and uses its circumference to compute the distance traveled. I compared the distance computed by the bike computer to my car odometer and to Google maps and the results were a very, very close match. Detailed manual cane with clear instructions, making the installation easy for me. First time user for