Here's a quick look at the specs, features, pros, and cons of the Bosch HDH181X-01 hammer drill/driver. This information was excerpted from a tool test in the Spring 2015 issue of Tools of the Trade. The main story contains an overview plus runtime and power test data for all tools tested.

Bosch HDH181X-01
Battery: 18 volts; 4.0 Ah
Battery gauge: 3 bars; on battery
Weight (pounds): 5.0; with handle 5.44
Rpm: 0-440; 0-1,850
Hammer Bpm: 0-27,500
Other Features: LED headlight; 9-inch side handle; stop rod
Price: Kit $269; bare tool $182
Includes: Tool; 2 batteries; charger; fabric case; magnetic bit holder
Country of origin: Tool and battery; Malaysia
Performance: Rated good under heavy duty uses and a mid-line performer overall. Fifth in runtime. (See comparison tables in Main Story)
Comments: Drops off in power sooner than expected for a big tool, especially in high gear.
Pro: Motion sensor in base shuts motor off if tool jerks violently, such as when a bit binds up. Free-spinning ring at the end of the chuck minimizes friction damage to adjacent surfaces.
Con: Headlight too close to the grip which causes your hand to shade the light, especially with gloves on. Only light in test with no delayed shut-off makes it difficult to use as flashlight. No belt hook, and no mounts for one. Flat fabric briefcase least-preferred style for job-site tool case.