A Simple Compact Pet Camera on Wheels Photograph: Molly Higgins Photograph: Molly Higgins Photograph: Molly Higgins There's a lot to love with this compact pet camera on wheels. It uses a 16GB SD card (which you can swap for one with more space if you need) instead of a pricier Cloud subscription fee, and it traverses terrains easily (up to four degrees uphill), from high-pile carpet to hardwood to doorways. It also has a charging dock, so it doesn't need to be plugged in manually. Maintenance is super easy: When the pet camera-robot's battery is low, it automatically returns to the charging dock using built-in infrared scanning technology. Charging takes about two and a half hours and lasts for about five hours.…