The OPPO HM-31 is a very compact, very precise device with a single purpose – connecting up to three HDMI sources to a single HDMI input on your HDTV.
The HM-31 uses the HMDI 1.3 spec and supports 720p, 1080i, 1080p, DeepColor and all common HDTV screen resolutions.
The HM-31 itself is 7.375″x4.5″x1.06″ and it weighs only 9oz. It looks small in the hand, and even smaller next to an HDTV. The body is made of plastic and aluminum. While this may sound flimsy, the HM-31 feels very sturdy.
On the front of the HM-31, there are three indicator lights to show you which HDMI line is active, an infrared receiver, a power light and a manual button to switch between HMDI sources without using the remote control.
On the back of the HM-31, there’s a 5V DC power plug, an RS-232C port for RS-232C remote controls, an external infrared sensor input, a single HDMI output and three HDMI inputs.
On the bottom of the HM-31 there are three mounting hooks so the HM-31 can be mounted on a wall or against some other surface.
The remote only has four buttons -rotate, 1, 2 and 3. Rotate is used to switch to the next HDMI source. The 1-03 buttons relate to the three HDMI inputs. The remote uses a replaceable 3V Lithium button battery.
Included with the OPPO HM-31 are four thin foam pads to protect the surfaces the HM-31 is placed upon, a synthetic fiber pouch for the HM-31, a handy instruction booklet and the power adapter.
The HM-31 uses only 5 watts of power, so you can leave it on without doing too much damage to your electric bill.