The key features of Winkko cordless impact screwdriver include:
1. Impact mechanism: Unlike conventional drills or drivers, an impact screwdriver utilizes a hammering or impacting action to deliver high torque output. This mechanism allows it to drive screws more effectively, especially in tough materials or situations where resistance is encountered.
2. Clutch to release torque when the screw/bolt is tightened, so as to protect the screw head from damage.  
3. Quick-change chuck: Typically equipped with a quick-change chuck system, which allows for easy swapping of screwdriver bits or drill bits without the need for additional tools.
4. Compact and lightweight: Designed for portability and maneuverability, making them suitable for use in tight spaces or overhead work.
5. Built-in LED lights to illuminate the work area, enhancing visibility, especially in dimly lit environments.

A "Cordless Chainsaw" is a type of chainsaw that operates without the need for a power cord, instead relying on a rechargeable battery for power. This type of chainsaw offers greater mobility and flexibility compared to traditional corded chainsaws because it can be used in areas where access to power outlets may be limited or unavailable. Cordless chainsaws are commonly used for tasks such as tree pruning, cutting firewood, and general outdoor maintenance. The primary limitation of conventional cordless chainsaws is their inability to deliver ample power. 

Cordless impact wrenches are commonly used in automotive repair, construction, and maintenance applications where portability and ease of use are essential. It becomes more and more popular because
- Portability: Cordless impact wrenches don't require a power cord, offering greater freedom of movement and making them ideal for use in areas without access to power outlets or in outdoor settings.
- Convenience: Without the need to plug into a power source, cordless impact wrenches are easier to set up and use, allowing for quick and efficient work.
- Versatility: Cordless impact wrenches can be used in a variety of applications and settings, from automotive repair to construction projects, thanks to their portability and ease of use.
- Improved battery technology: Advances in battery technology have led to longer battery life and faster charging times, reducing downtime and increasing productivity.
- Safety: Without the risk of tripping over cords or getting tangled in them, cordless impact wrenches offer a safer working environment.

Cordless drills offer several advantages over their corded counterparts:
- Portability: Cordless drills are highly portable due to their battery-powered operation. This portability allows users to work in areas without access to power outlets or in outdoor settings.
- Convenience: Without the need for a power cord, cordless drills are easier to set up and use, offering greater flexibility and convenience during use.
- Versatility: Cordless drills can be used in a wide range of applications, from drilling holes to driving screws, making them suitable for various tasks in construction, woodworking, and DIY projects.
- Ease of Use: With no cords to manage, cordless drills are simpler to handle and maneuver, reducing the risk of tripping hazards and making them more user-friendly, especially for beginners.
-Improved Technology: Advances in battery technology have led to longer battery life, faster charging times, and higher power output, enhancing the performance and efficiency of cordless drills.
- Safety: Cordless drills eliminate the risk of accidentally cutting or tripping over cords, providing a safer working environment for users.