The Master Pro MP CL IM 4500 (MP CLIM) is a cordless, brushless impact wrench designed for home and professional use. It features an efficient brushless motor powered by a 21V Max Lithium-Ion battery system. 
The tool is typically sold online in a multi-piece kit that includes two batteries, a charger, and a 25-piece accessory toolkit. 
Key Specifications
Motor Technology: Brushless
Power Source: 21V Max Li-Ion Battery (Typically includes 2 batteries and 1 charger)
Torque Output: Rated between 330 Nm to 450 Nm depending on the specific retail package
Rotational Speed: Variable trigger up to 3300 RPM – 3800 RPM no-load speed
Drive Size: 1/2-inch square drive
Chuck Size / Type: 10 mm Keyless
Core Features & Functionality
Premium Auto Brake-Stop Mode: When operating in reverse mode, the wrench detects when a nut or bolt breaks loose. It automatically drops its speed and torque to keep the fastener from flying off or getting damaged. 
Electronic Brake System: Stops the motor instantly when the trigger is released, reducing sudden kickback and preventing wrist strain. 
Ergonomic Design: Built with a pistol grip handle and comfortable rubber cushioning. It includes an integrated LED work light for dark workspaces and a built-in battery power indicator.