Turn the chuck until you hear a loud click. Really powerful and fun to use. The batteries love being recharged. It's lightweight and recharges quickly. This is a replacement for one that was burned up.
Bosch Features & Specs
Shortest height ,head length, and lightest weight make this tool great for overhead and tight area work
Newly developed 3/8-inch single sleeve chuck to accommodate 90-percent of common applications
Fuel gauge allows for easy battery management
A wide variety of general purpose accessories
High-quality materials and fabrication
Tough jobsite case
Power Source: Battery Powered
Voltage: 12 volts
Editor's Impressions Of The Bosch
Tool Motor Power
Torque
Value For Money
Build Quality
Feature Set
Bosch Final Thoughts
"Feels well built."
And the case is nothing special. I especially like its power and light weight. Has a drill setting and a screw setting. I charged a battery in about 3 hours. It was also easy to get different bits in and out.