Microsoft's Surface product line has grown over the years to meet the various demands of consumers. For those who own a Surface Pro 3, Pro 4, or new Surface Pro however, you may be interested in innovative ways to expand its form factor. Or maybe you just really want a Surface Book, but can't afford it now. The Brydge 12.3 Bluetooth keyboard is one possible solution that turns your Surface Pro into more or a laptop. I was skeptical of such a device, but after spending a few weeks with it, I'm (mostly) impressed. Here is what I like, and what I don't.

See at Amazon How it works The Brydge 12.3 is a standalone Bluetooth 4.0 keyboard that has its own battery and costs $150. Micro USB charges it, and it should last around three months on a single charge. Obviously, that can vary, but the Brydge 12.3 should last at the very least weeks even with extreme usage.

You just pair the Brydge 12.3 to the Surface Pro 3 or 4 using Windows 10 and the Bluetooth configuration. Next, you slip the Surface Pro into the shims at the edge. They are quite firm, and it requires pressure to slide in the Surface Pro. The good news is that means the Surface Pro will not slip out. The unwelcome news is this is not something you want to have to do repeatedly, so the setup presumes you'll leave the Surface Pro in the Brydge for extended durations. If you must separate them, you just tug.

Once paired the Brydge 12.3 acts just as a keyboard, and it makes the Surface Pro feel like a laptop. Brydge 12.3 features and quality Made from an all-aluminum chassis, the build quality is excellent on the Brydge 12.3. Out of the box, the Brydge 12.3 is configured for the Surface Pro 4/Surface Pro, but there are extra shims in the box that fit the Surface Pro 3.

The Brydge 12.3 works with the all-new Surface Pro (2017), as well. Everyone I showed it too was impressed with how durable and stable it feels. Part of that is the weight, which is 1.4 pounds (652 grams). That means you are effectively doubling the weight of your Surface Pro.

The reason for the weight is just physics. To prop the 1.7lb Surface Pro up into a laptop mode without the kickstand, you need similar weight to offset it. The Brydge 12.3 opens to a maximum of 160 degrees much like a "real" laptop. The Brydge 12.3 is also the same diameter as the Surface Pro. It feels like squishing two Surface Pros together. To be fair, it all feels very dense, robust, and even rugged. But your light Surface Pro becomes a heavy laptop weighing 3.41 pounds (1.55 kg). That's a significant tradeoff. The Brydge 12.3 keys are chicklet-style with plenty of travel. I enjoy the way they depress and feel. They also support three-stage backlighting, which is a very nice touch. Part of the extra weight of the Brydge 12.3 goes to an internal battery for the Bluetooth and to also power the backlighting.

The Brydge trackpad is smaller than that of the Surface Type Cover. It's glass and while not Precision (so it doesn't support all Windows 10 gestures) it is better than average. However, when you close the Surface Pro on to the Brydge, you need to hit the power button the Surface Pro to turn it off. There is no way for the Brydge to know your Surface is off because unlike the Type Cover, it is not physically connected. If you open the Surface Pro and hit the power button, the Brydge automatically pairs again. The process is fluid and fast requiring no wait times so you can dive into work.