it's exactly what I needed! I was looking for a monitor I could bring to our cabin or camping where there is no power and needed a monitor where both parts ran off battery. So the part that I'll carry (parent one) is a rechargeable battery but it says it lasts 18hrs so I plan on buying an extra rechargeable battery and just making sure I turn it off at night. The part that stays with the baby uses 4 double A batteries. Best part, that can also plug in! If you're looking for a monitor that can go further distances too this ones great! I attached a photo of how far I walked away from my house to test it out and it was very clear still through a dip and some trees. THis monitor is great!!
It may surprise you to hear that simply being able to last through the night, unplugged, with the display off, qualifies as exceptional battery life for a baby monitor. The Infant Optics was one of the only monitors in our testing that could easily do that, and then last a while longer the next day before needing a charge. (The manufacturer claims it lasts 10 hours with the display off—we got that amount of time off of a full charge, even when checking the display intermittently.) This model also charges via a USB connection, which sets it apart from competitors, some of which use ineffective and inconvenient proprietary DC chargers or even disposable batteries.
I was taken aback at how easy the monitor was to set up and quickly fell in love with the additional features. The sweet little light show and lovely music is perfect for setting a calming environment and my baby loved gazing at the lights. The talk back function was brilliant and the monitor is sensitive enough yet not too loud. The no interference feature is also great – our usual monitor picked up everything and crackled like a horror film! The biggest sign I’d recommend the BT Audio Baby Monitor 450 to other mums? We ditched our more expensive monitor with a movement sensor and have stuck with this – it hasn’t been switched on since!
We had the 150 for our daughter and bought the 250 when our son was born. The 250 has superior sound quality but thats all it has going for it. The battery life is very poor, it no longer lasts more than five hours so when we take it up to bed with us it starts beeping at about 4am. There is a number to call for replacement batteries but they never answer the phone.

Traditional video baby monitors don't offer the same high-resolution picture quality we're used to seeing on our smartphones and tablets. If you want high-resolution video of your baby, you'll have to go with a Wi-Fi monitor like the NestCam that streams video to your phone or tablet. The Phillips AVENT SCD630 video monitor may not be high-res, but it's the best of the bunch.

Motion and audio sensors: In the old days, parents were forced to endure a consistent ambient hiss from their audio monitors while they listened for their child’s stirrings or cries. Mercifully, many modern baby monitors will stay in “quiet mode” until they detect motion and/or sound, which will trigger an alert, such as activating the handheld video display or pushing a notification to your smartphone.

I did recently downloaded Baby Monitor by Annie from Apple store and it works great! Don't really need to buy the expensive monitoring devices as with two children, I don't have much money to waste really. Of course it's for the safety of the children, so it's not really a waste, although I can easily use this app and it does everything what the big baby monitors do and even more. I've just used my old ipad as the second device placed near my LO.
All baby monitors should have clear sound quality, minimal (or no) interference and a good range and signal strength (which manufacturers often exaggerate), particularly if you have a larger home and garden. If you want to see your child, as well as hear them, you’ll need a video monitor. Or perhaps you’ll be more reassured by movement sensor pads, which sit underneath the mattress and set off an alarm if there’s no movement for 20 seconds – although for some people, this just causes more anxiety (and there is no evidence it can actually prevent cot death). 
The best cheap baby monitor. Works really well and has really good range and battery life, but this is our 3rd monitor from willcare, first one stopped connecting to the baby and parent unit, second, the charging port broke off and now we have our third. Customer support is good about helping out. But I highly recommend it! And at the same time I say keep a secondary, just in case this one stops working and are waiting for a new one.

Wi-fi baby monitors are the latest innovation in high-tech baby gear, and they’re super convenient. A baby monitor with wi-fi allows you to connect anywhere that has Internet service or Bluetooth capability, and the monitor can often be controlled remotely using a smartphone or computer. This functionality makes the wi-fi baby monitor great for travelling (unless you’re heading to a remote location). Safety tip: No matter what connection you use, be sure that it’s a secure connection in order to prevent your monitor from being hacked.
Just because you’re pulling double diaper duty doesn’t mean you need to buy two baby monitors. If you’re a twin mom, simply look for a monitor that can accommodate add-on cameras. The Babysense Video Monitor comes with two digital cameras right out of the box (and can handle up to four), making this the best baby monitor for twins. With the push of a button, you can toggle between views of your twin babes. Plus, this monitor features digital pan/tilt and zoom, two-way communication, room temperature monitoring and a 900-foot range.
You can get the same system, with a traditional monitor screen that’s slightly smaller at 4.3 inches, for cheaper. If you’re interested in having two zoom cameras or an app that lets you see your baby while away, Project Nursery offers those configurations as well. You can also record video and take photos with it as well (requires an SD card sold separately).
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