According to our research online, the difference between Dirt Devil BD10125, BD10165, and BD10175 are the included tools, volts, and weight.

image from manufacturer

1, All of them includes the built-in crevice tool. The BD10125 is the only model of the Dirt Devil Gator series that has no power brushroll attachment, the BD10165 and BD10175 come with a Brushroll Attachment which has its own motor. There is no separate control for the brushroll, when the unit is on, the brushroll will be on.

2, The BD10125 and BD10165 use 15.6 volts battery while the BD10175 uses 18 volts battery.

3, According to specs info on dirtdevil.com, the BD10125 weighs 3.45 pounds, the BD10165 weighs 3.2 pounds, the BD10175 weighs 4.1 pounds.

4, The BD10125 is the cheapest while the BD10175 is the most expensive one. At dirtdevil.com, the BD10125, BD10165, and BD10175 are priced at $44.99, $54.99, and $59.99 on September 12, 2014.

All of these 3 Dirt Devil Gator cordless bagless handheld vacuum cleaners has a 2.25 inches wide nozzle, rinsable filter, Energy Star rated battery charger, use Nickel Cadmium battery, 24 hour charge time, and carries a 3 year limited warranty on parts and motor.