Does it have a battery back-up? Will it go blank and reset when unplugged?
1177201
It does *not* have a battery backup. Some settings survive a power outage, but some do not. For example, the setting to *not* go into power saving mode is not preserved; the "standby" mode - you have to reset the "standby" power level whenever the power comes back on - to disable that feature is you set the "standby" power level to 0 (zero) watts. The option to turn off the PIR motion detection feature does keep its setting when the power is restored. I don't know what happens to other settings that I do not change from their default values.
1177202
if you unplugged and left it for a while, probably an hour, it'd reset. I don't know how long the battery last, but it does have some kind of backup
1177203
It does not have a battery back up, you must record the info before you unplug it.
318733
No, it doesn't. It resets if you unplug it. Regardless of whether it stays plugged in or not, every time you turn it back on you have to manually set the "thermostat" function and temperature, although if it hasn't been unplugged it will default to the last temperature you set it on. There is a light on the front panel so that you know whether it's on automatic/thermostat or just "on".
500726
It does not. I just confirmed it with the one I just got - unplugged it - pushed the power button - nothing. Nice display though. The rechargeable battery seemed like a weak feature anyway because it was only rated at ~1-hour of use.
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!
2257046
Yes, it has it's own internal battery. As far as a complimentary, back-up battery, No it does not. That would be nice, and a very good selling point.
1933313
it does have a battery back up. but you must install batteries and use the ac adapter for power source.
480076
I, frankly, don't remember exactly. But I have an impression that it's supposed to be plugged-in, no battery.
1825911
Below is what the tech specs say about loss of power. There is no replaceable battery that I see. I suspect it the local time is saved via a capacitor type back up and the other settings are stored permananetly any time you set them. I have only reset mine once and that was because I wanted the light to come on later because of holiday deco's on the porch.Power outage: The screen is blank. Only the time must be set if the outage lasts more than 4 hours; all other settings and programs are permanently saved.
620623
Just tested. Yes, if you unplug and then plug again it will start running without a resetting.
480077
Its required to be plugged in to work. There is also no battery backup so when the power goes out or it is unplugged all the settings are lost.
1489681
Yes it does, see the little silver button in picture one on amazon, it's actually an plug. At first it seemed that it only works on battery power, but I keep mine plugged in (to a battery backup/ surge protector) without a battery in it. And I have opened my unit 2-4 times a day- every day-for over a year without 1 problem.
394552
No battery that I know of, but it does retain settings in the event of a power outage.
958961
Not really, unless you consider that to get it to light up, there is a minimal current draw while the unit is lighted up. When you unplug, there is no current draw. It really doesn't "Test" to get an accurate reading. It just shows what the battery reading is.
1023953
No it does not. Ac power plug only and batteries for backup in cast of a power failure. I believe the battery backup is good for about 8 hours. We are very please with this product. As I said before, it is a little tough to get the timer set right ( of course I am pretty dumb when it comes to these things ) but once it is working, you will almost forget about it.
2283258
There is battery back-up for a specified number of hours. I use the prerecorded message that came with the device. So far when the power has gone out, all I have to do is reset the time and date.
1198492
Actually, according to their web site it does have battery backup:http://www.p3international.com/products/p4460.htmlHowever, people are confused about what battery backup means. With the P4460 once you unplug it from the wall the display is disabled and it no longer records data, however it _does_ retain the information that has been collected thanks to the battery backup. Once the device is plugged back in data can be displayed and more data collected. The user entered settings for price per kWh are also retained. The P4400, on the other hand, does not have battery backup and loses all data once it is unplugged. Actually, according to their web site it does have battery backup:http://www.p3international.com/products/p4460.htmlHowever, people are confused about what battery backup means. With the P4460 once you unplug it from the wall the display is disabled and it no longer records data, however it _does_ retain the information that has been collected thanks to the battery backup. Once the device is plugged back in data can be displayed and more data collected. The user entered settings for price per kWh are also retained. The P4400, on the other hand, does not have battery... » Read More Actually, according to their web site it does have battery backup:http://www.p3international.com/products/p4460.htmlHowever, people are confused about what battery backup means. With the P4460 once you unplug it from the wall the display is disabled and it no longer records data, however it _does_ retain the information that has been collected thanks to the battery backup. Once the device is plugged back in data can be displayed and more data collected. The user entered settings for price per kWh are also retained. The P4400, on the other hand, does not have battery backup and loses all data once it is unplugged. « Show Less
2124007
No, it does not. I use it in my office when I am working, so It's never unattended and I always unplug it when done. Possibly the o ly thing that made me hesitant about buying it.