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The The Oregon Scientific Prysma projection alarm clock measures 20x8x2cm which includes the 4cm wide part at the end that swivels to project onto a wall or ceiling, more about this feature further down.
I had just plugged the unit into the power socket and was about to look at the instructions as to how to set the correct time when the phone rang, a short call that involved me saying ‘no’. I then looked at the display to see that the time was now correct. However if you are not in an area where satellites are immediately picked up the instruction sheet does detail how to set the time.
One outside temperature unit is supplied it is 12x5x1.5cm and is powered by two ‘AAA’ batteries that are supplied. It can work on any of five wireless channels.
Overall the main unit can display up to five other units temperatures which it displays sequentially. I had another unit so I set one unit to display on channel two and the supplied extra unit on channel four, so what I get is --, on the other three channels. All the time the main unit displays the time and internal temperature as well as the sequential scroll from the other units.
My unit was black with the end projection unit in red.
The main display is red with a paler backlight, easy to read both a lit or unlit area. The main figures are 1.5x2.5cm and easy to read.
The size of the projection area varies according to the distance away what it is displayed on, I used a ceiling two metres away and the circular projection area was over 30cm.
This display shows the time over half the display and either above or below it the sequential temperature.
According to where you have the main clock and what you display onto you may find the display is upside down just press a button on the main unit and it is reversed. The time numerals are 9x6.5cm two metres away.
The instructions are in one large multi language sheet and although the paper is thin and the type small they are readable.
There are five buttons on the back of the unit and various combinations control the unit. Should you use it in the bedroom then the unit has two different alarm functions.
The clock of course keeps perfect time as it is undated by satellites and it is possible to display date etc should you wish, the clock is easy to read even for those of us who wear glasses, in anything but a brightly lighted room the projection display is excellent and it can enable you to keep an eye on external temperatures in sheds and greenhouses from the warmth of your lounge.
The Oregon Scientific Prysma is available from the link below for £49.99 with free delivery; I see other colours are available.
http://www.amazon.co.uk/gp/product/B00NM5BOQE?ie=UTF8&tag=gadge0a-21&linkCode=as2&camp=1634
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