Does the type (exemple type qh-0251) matter when ordering these? i need 4 receivers and want to make sure they will all the able to connect. thanks

I believe the paperwork on mine says it can connect up to 6 or 8 devices using 1 unit. The only downside is it doesn't give a different noise for each one. I've got two receivers so when it goes off I have to look in my front yard and in my backyard to figure out which one is going off.
By Tiffiny on October 10, 2015
Yes it 'probably' does. the newer versions are -0200 series is the is a version prior to 1 Feb
By Ricky P on February 19, 2016
I just got two additional 1byOne sensors. Factory manual in the boxes says 5 sensors can connect with 1 receiver. Think it best to believe factory.
By J_Onyx on April 5, 2018

How long do the AAA batteries last in the transmitters?

They have been in since I bought it in April and they are still going. I bought the electric adapter for the receiver.
By Chas on August 10, 2015
Says on the instructions depending on the batteries they could last 12 months, if you were using 1150mAh batteries based on 10 sounds per day, with 80% battery capacity available.
By Matthew V. Carrasquillo on July 19, 2016
how long do batteries last
By Palmsandpines on September 9, 2016

Can the transmitters and receiver be in different rooms?

Yes, up to 300ft. I have mine going 50ft and thru several walls.
By Kevin F. on April 6, 2015
Yes they can... in fact the transmitters can be outside with the receiver inside. We have two transmitters and two receivers. Both transmitters are outside (one on our back porch and one on the other side of our house). The two receivers are located inside the house (one downstairs in our bedroom and one upstairs in… see more
By R. Holliday on April 6, 2015
Yes, but only one transmitter works, and defeats the purpose of having two
By amanda armijo on April 5, 2015
Yes, its intended to be used in the driveway. (If i understand the question correctly)
By stebbie on April 5, 2015
Yes, but only one transmitter works, and defeats the purpose of having two
By amanda armijo on April 5, 2015
I don't know, in still waiting for my shipment
By Ronald Goodspeed on April 5, 2015

I'm thinking of using this to dissuade home intruders. Does it have a real alarm (not a chime) and does it turn itself off? Is it loud enough?

It is a motion detector, with two sensors that you can put outside, and an inside alarm unit. It is not an "ALARM" as in a siren, but more of an Alert Tone (like walking into Radio Shack). There are I believe 2 types of loud alarm alerts and one silent with lights - and there is no volume control. The benefit… see more
By TPIL on June 3, 2016
This is more of a chime then an alarm. I'm not sure but there may be options for the sound. This is really more for letting you know someone's coming into the area verses an alarm.
By Mel on June 2, 2016
There is a botton on the side which you can choose from chime, low and alarm. The sound goes off itself after sereval second, and the ring tone is about 100dB. Thanks for your contact and wish you a good day!
June
1byone Service Team
By 1byone Service Team on June 3, 2016
This does have a real alarm, not real loud but will make an intruder think, not sure if it turns off by itself but will work.
By huggy on June 16, 2016
this partucular alarm sounds off indoors so it woulud not be heard outside. This is more to alert homeowner of of people crosskng entry ways. But there is one on Anazon that has an outside alarm that would scare off perps. I almost mistakenly got that one. :) good luck.
By Darlene C on June 2, 2016
I finally found a way to reply back to you. I hope this helps. http://www.amazon.com/Solar-Powered-Motion-Sensor-Detector/dp/B003RBP2PC/ref=sr_1_1?ie=UTF8&qid=1464884539&sr=8-1&keywords=outside+alarm+motion+sensor Darlene @ladybugsluck9@yahoo.com
By Darlene C on June 2, 2016
When turned up it is pretty loud and you can choose bell or chime and it goes off for about 5 seconds unless it is still sensing the motion.
By NaTasha on June 2, 2016

Do the devices (sender/receiver) have to remain on at all times to stay paired? Can I just turn on the units as needed and not have pair them every t

I'll leave the master off all the time except when I need it and the sending units seem to work and hook up or pair up each time
By William MacMonegle on February 22, 2016
I leave mine on, but I would say yes, they will stay paired.
By CPhilips on February 22, 2016
No, you needn't to pair the sender/receiver when you turn on the units again.
By 1byone Products Inc. SELLER on February 23, 2016

can i use this to make my driveway alert work in australia on 240 v

No, this works in110-130V. Thanks for your contact!
June
1byone Service Team
By 1byone Service Team on June 27, 2016

The adapter shows it operates on 110-240v. Why the customer support team say "No" it operates on 110v?

Dear customer,
It does operates on 110-240v.
Best Regards,… see more
By 1byone Products Inc. SELLER on May 11, 2017
works on 110v
By Amazon Customer on May 10, 2017
because the man or woman is right it works only on 110 v
By Mike Carr on May 10, 2017

at what frequency and mode are the sensors transmitting? wondering if signal will go through 200 feet of woods

Can not answer the frequency but wireless and have had similar that worked on a road with some trees by no hill in the way. I have mine indoors and works thru walls and insulation. See Amazon now has brand with multiple tones setting which might be nicer if using inside for this one is loud but works well.
By Firefly on March 14, 2018
The frequency of the sensor is 433.92 MHz. And the recommended installation height is 1.0 m to 1.5 m, you can adjust the height or the angle or tilt it down some to make sure its PIR facing the entire monitoring area.

1byone Service Team
By 1byone Products Inc. SELLER on March 15, 2018
I don't know. Sorry!
By Snoozer on March 14, 2018

I want to use them for security and monitor coyote problems. Can I just tape cover the sensor and color paint to camouflage the white plastic?

I bought an Olymbros Motion Detector previously. It is a camouflage surface color and good for outdoor (ranch/forest/yard/farm) monitor. I recommend that.
By Vicky Hills on February 13, 2018
I masked off the lens and painted mine a brown to match the area. I now only get about 25 feet of range between the transmitters and reciever. Used regular outdoor house paint. It must be some super rf blocking paint.
By Buck on February 9, 2018
I think you will need to leave the since the area clear but you can camouflage the rest of it for I use duct tape to cover my white area and camouflaged it by my mailbox.
By huggy on December 11, 2016
If what you really mean is can you use opaque masking tape to cover and conceal the small LED activation indicator that is on the front below the wide sensor window then yes you can as doing so will not have any effect on the operation of the transmitter -- and painting the white plastic case will also have no effect o… see more
By Misfit Toy on April 8, 2018