How do you turn off the calculator? I see an "on" button; though it is solar as well as battery backup, how do you save the battery power? thanks
1852431
There is no off button, it switches off automatically when not in use and not in a direct light source. It will save the power harnessed from any light source directly into the battery.
1852432
It has auto turnoff as others have said. The battery will probably outlast the calculator.
1852433
It's a solar calculator and there is no Off button. The calculator goes off by itself. This calculator lasts a very long time. I have another one that is very similar and I have had it for over 6 years. The only reason I purchased this one was because I got tired of my son always taking it.
1852434
It switches itself off after a minute or two. Consumer-type calculators haven't had an on/off switch for 30 years.
1852435
You just let it sit for awhile and just goes off. How it does it I do not know. As for the batteries - I had another one of these for at least 8 years and I never had to worry about the batteries. In fact, I do not know where the batteries are, or how to change them.
1852436
There is now an OFF button in the upper left corner of the keyboard. It also turns off automatically.
1852437
It turns itself off relatively quickly once no activity happens for a few minutes. I have never timed it to see how many minutes....maybe 4 or 5?
2071386
There is no need to turn it off. I've had this for two years and batteries are still working. It goes into a low draw sleep mode. Don't worry about it.
522633
This calculator has a dual power source: a photovoltaic cell used when there is sufficient light, and a battery for use when the light level is low. The battery is a LR44 (or equivalent) button cell. You have to remove the back of the case (seven philips-head screws) to get to the battery. The recommended replacement interval is every three years. This information is on pages 14 and 16 of the "User's Guide 2 (Additional Functions)" manual that comes with the calculator. By the way, I have had mine since July 2005 and I still use it regularly.
1794657
The calculator uses type CR2032 which are not rechargeable but you can buy 5 batteries of that type for around $2.50. If you work in a reasonably well-lit place, though, you may never need a replacement battery as this calculator is dual-powered by solar energy first. I've been using mine daily for about 6 months without any problem at all.
943932
It is not possible to turn off the display at any time, though you can adjust brightness from 0-100. The best technique to use to conserve battery life is turn the unit off when not in use. This only takes a second or so.
761040
I believe not be possible to turn off the clock. But the battery drain is minimal. Sometimes occurs the batteries fail and continue running clock for weeks
341340
Unfortunately, this model does not have a battery back-up. So if you turn it off it will reset to the default mode. If you think a bright light will kill the mood imagine a bright light along with the loud announcement of: "You Are Trespassing!!!!" Scared me to death the first time our power failed. There are other similar models that do have a battery backup so that it will not reset/loose any video when the power is cut. Good luck!
900111
This guy has an on/off switch so you can turn it off when not in use. I have taken several time lapses of 300+ pics and I al still using Google the original batteries. Two things to consider: 1. These are stick batteries, so it's easier to carry additional batteries with you. 2. The draw back of on/off switch is that you have to reset all your parameters every time you turn your timer on as the settings are wiped out every time you turn it off. I hope this answer red your question.
1143378
It has a weather channel. You can tune into it, and put the radio on stand by. Once a warning or sever alert is played back, the radio will turn on and play back the message. The battery gets empty very quickly like this, so make sure you have an alternative source of energy (like put it next to the window where the solar panel can provide power, or plug in the ac adaptor).
1309234
I'm not sure what you mean to power off. Once the batteries are inserted you will always have a display of "00:00". If you are asking how to clear the display you need to press the two small button located under the display at the same time to set the display back to "00:00". The only way to power off, as with most timers, is to remove the batteries. There is no on and off switch to completely turn off the timer. Hope I answered you question.
1512929
Yes. The person that uses it responds..."It is the only calculator I have found that has 10 key functionality that does not have to be plugged in since it uses solar power and a battery that I have never had to replace after 10 years."
1096428
Robert, I LOVE this machine! You can turn it on with the switch at the top of the calculator, far left of the Heavy Duty logo, and switch to off/on/print. The choice is yours!
1553672
The same way you turn it on. There's a marked power button on the lower left of the case. Tap it to show how much charge remains in the backup battery. Hold it down to turn it on if the backup battery is currently off. Hold the button down while the backup battery is on, and it'll turn off.
991688
If you after it turns off ? It doesnt replay your equation after it turns off then turn it back on. It only shows the last answer that was calculated. It can only memorize the last output before shutting down
1038805
Pressing the start/stop button stops the timer from running, but the numbers still appear. Other than popping out the battery, I don't know how to turn that part off. I leave mine on, to that extent, and haven't yet had to replace the battery - it doesn't seem to go through them very fast.
1780454
I have two of these. Have had them both for years. I have never changed the batteries. I always turn it off on the bottom when I sleep or turn off the laptop. Side note - if you sleep the laptop, THEN turn it off, it will turn the laptop back on. Gets into a weird kind of cycle. So I've gotten used to turning it off, then sleeping the laptop using keyboard shortcuts instead.
1214363
There are 3 buttons: go, stop, and reset (I believe). So the display is always visible. It's either all zeros, counting in action, or counting on pause. I haven't needed to turn it all the way off, but I imagine that would require removing the battery.