Your phone might not have great battery life. Many parents who use a wifi baby monitor come to the realization that their smart phone battery life isn't so great when they are streaming a live video and audio feed from their baby monitor. If you have a newer iPhone or Android device, it will probably do pretty well, but if you have an older phone the batter is probably a bit weaker already and you will notice your battery life dropping pretty quickly during use. So definitely consider battery life and charging options for your smart phone when you are choosing between a self-contained versus wifi baby monitor. 
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.
Will Greenwald has been covering consumer technology for a decade, and has served on the editorial staffs of CNET.com, Sound & Vision, and Maximum PC. His work and analysis has been seen in GamePro, Tested.com, Geek.com, and several other publications. He currently covers consumer electronics in the PC Labs as the in-house home entertainment expert... See Full Bio
From a pure imaging standpoint, night vision is vital for watching your baby sleep from another room, and is standard for most baby monitors. Motorized pan and tilt (which lets you swivel the camera from afar) isn't quite as common, but is very welcome if you have a toddler and want to scan an entire room. High-definition is a nice plus, but you don't need the highest-resolution sensor to keep tabs on your baby—most of the monitors we test use 720p cameras rather than 1080p.
Clarity of Daytime and Night Vision: When wireless baby monitor systems with screens were first introduced onto the market they used somewhat outdated display technology that made for a grainy, distorted and often unreliable picture. Newer baby monitors use a liquid crystal display similar to the ones used in your smart phone and other consumer electronics, so these HD video baby monitors tend to have very nice color contrast and high resolution, and are also substantially more reliable. All of the stand-alone baby monitors we list above have high-quality displays, and we do not recommend some of the relatively old fashioned ones that can still be found on the market. Of course, night vision doesn't use color - so the display will be either grayscale or show a slightly green hue. That's important to keep in mind before you try it out for the first time; not even military special operations have color night vision, so don't expect anything amazing, even from the best baby monitor!
The writers of this guide separately logged more than six years of daily baby monitor use as parents before this project began in spring 2017. During the more focused comparison-testing phases of this research, we put in more than three consecutive months of nonstop testing, day and night, rotating multiple monitors in and out of various rooms throughout our homes.
Monitor options: We wanted easy, intuitive, responsive controls, whether they were on a touchscreen or physical buttons. We also wanted the monitor to withstand being knocked off of a nightstand or messed with by a toddler, and generally be tough enough for the rigors of life in a home with young children. We didn’t really care if we could set an alarm, use the monitor as a night-light, or play chintzy music through the camera—but seeing the temperature in the kids’ room was a detail we appreciated.
Receiving 4.1 out of 5 stars (and well over 500 5 star reviews) based on about 900 reviews from Amazon customers, the Dropcam Pro is lauded for its “very good video quality,” premium material assembly, quick and easy setup/commissioning and a field of view (130° diagonal) wider than most of its competitors. It also has PTZ (pan/tilt/zoom) camera and two-way talkback. Note that this product does not come with a separate, dedicated monitor; it uses mobile and web apps capability for PCDs such as smartphones, tablets and other computing devices. The Dropcam Pro supports dual band Wi-Fi (the standard 2.4 GHz and 5GHz) for improved wireless connectivity.
This monitor is known for its zoom lens, included in the box, that lets you see your baby up close even if you have to position it farther away from the crib. You can use the monitor to remotely adjust the camera, and you don’t have to worry about plugging the monitor in overnight—it can sit on your nightstand for up to 10 hours in the power-saving mode (similar to sleep mode on your computer, but it still provides sound monitoring while the display is off) and up to six hours with the display screen constantly on.
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