I use the NOCO Genius G26000, which is built for both 12 and 24 volt systems. It works very well. It is found in many auto stores, but Amazon is probably the best pricing.
Wiserfool
Just a note of caution. Most of these devices make you vehicle considerably more open to hackers. WiFi is far more open than Bluetooth. None of this matters on most offroad routes, but city driving is a different story.