Hammerhead Karoo 2 review: All about the updates 13 April 2021 · Review An assessment or critique of a service, product, or creative endeavour such as art, literature or a performance. 1 / 16 Quick verdict As an Android OS-based device, this bike computer does things a little differently. But unless you're really committed to specific Garmin features, the mainstay of Hammerhead's offering is excellent - the visible and recorded data, the customisation, solid build and good battery life - wrapped into a package that, from what we've seen, will only get better over time via updates.Read full verdict For Can take a SIM card Against