When I unboxed the TM3, it contained the monitor , the charging cable and a small magnet.I installed the monitor but there were no instructions to install the magnet, Although I know a magnet is needed, I thought that maybe the magnet that is used with the VC monitor to accurately count the strokes might be sufficient so I installed it with out the magnet to see if I really needed it. When I started to row, I saw that the stroke count was not accurate. It only detected every other other stroke. I could not find any instructions on how to install the magnet on the company web site. I was getting ready to return the product but before I did that, I went to Youtube and I found that the company did have a video on how to install the magnet. Once installed, the TM3 monitor works flawlessly. Therefore, I can recommend this monitor for water rowers. PS: Before I went to YouTube, I went to Redit to see if I could get more information. What I found was that others had the same issue but no solutions.The TM3 Monitor works well, therefore I would recommend that the company include information that directs the consumer to their very good YouTube video.