The Vis 180 is easy to fit, with an incredibly long bungee/ratchet cord that should reach anywhere for best placement at the rear of your bike.
It has two LEDs: orange and red. On its own, the flashing orange LED is noticeable, but with the pulsing red LED activated it’s unmissable: it hurts to look at when it’s on its highest power, meaning it’s visible for hundreds of metres.
The Vis 180 has a very impressive output yet, for essentially two LEDs, mounting requires a lot of space. The side-mounted button is easy to locate, but needs a firm push.