User submitted reviews
Review by Huffdawg1
I purchased this as on upgrade to the older 520 model. The 840 works really well and provides a lot of useful data while riding and post ride. Works well with my AXS Power Meter and nice to track both heart rate and power real time while riding. Only negative, this could be I have something set wrong, is that when connected to my Garmin headlight it would run the headlight on full power and drain the headlight battery in two hours. Not a huge issue for me. I disconnected the headlight and now it stays on daylight flash mode and last up to eight hours. Nice upgrade, solid GPS and works well with connected devices except maybe the headlight.
Review by Anonymous
This computer has everything I need on the bike. gps is accurate and tracks everything. touch screen makes map easy to use and the buttons make it easy to operate on the bike. Battery also lasts enough for my needs.