The Delvcam Camera-Top 7" HDMI LCD Monitor is great in that it's more on the affordable side and yet has a screen size that's among the larger sizes available, it's not absent of focus and exposure-assist features, it comes with useful accessories including a folding sunshade hood, and it impressively has an 800:1 contrast ratio, meaning blacker blacks and so sharper colors.
It powers by battery or by power supply. The power supply is included and so is a battery plate for a battery, but a battery is sold separately. The plate is a Sony-type F970, and the battery for it must be a likewise Sony-type F970 or similar Sony batteries. And if you want, you can optionally use other battery plates, for Panasonic and for Hitachi-type batteries.
The monitor's connections consist of an HDMI input and an HDMI output. The input is for connecting your camera signal into, and the output offers a few possible uses, the most beneficial of which is passing the camera signal to additionally another HDMI monitor, whether another small one or a large-screen one. HDMI cables stretch as far as about 10 feet, so you can position the second monitor a bit away from you, perhaps for someone else to watch as you're shooting (if you can't get rid of such a someone).
For attaching onto your camera, the monitor has a total of three 1/4"-20 screw-holes and comes with a hot-shoe swivel adapter that on one end will connect into one of the screw-holes and on the other end to the camera, connecting thus the monitor and camera together and providing you with a means to swivel the monitor atop the camera, to position it where best you want. The monitor also has VESA mount holes on its rear. These afford you with even more positioning options.
The focus and exposure-assist features mentioned above are only some of the image control features available on the monitor. The entire set consists of Peaking, Exposure, False Color, Histogram, Aspect Ratio, Color Bar, Underscan, H/V Delay, Freeze Input, Center Marker, Screen Marker, Pixel-to-Pixel, and DSLR Ratio Adjustment. Pixel-to-Pixel will let you select a portion of a shot and see it enlarged in a resolution much higher than the monitor's native resolution, so to help you judge the shot better. The monitor's resolution is 1024 x 600, and Pixel-to-Pixel displays in 1920 x 1080 HD. DSLR Ratio Adjustment is for use with select Canon DSLRs. What it does is scale video that doesn't completely fit the monitor's screen when in Record mode.