A speed-adjustable hand blender, also known as an immersion blender or hand-held blender, is a versatile kitchen appliance used for blending, mixing, and pureeing ingredients. Here are some common characteristics of a speed-adjustable hand blender:

1. Variable Speed Settings: Speed-adjustable hand blenders typically feature multiple speed settings that allow you to adjust the blending speed according to your specific needs. These settings often range from low to high speeds, providing versatility and control over the blending process.

2. Power and Motor: Hand blenders come with a motor that powers the blending function. The power rating of the motor can vary across different models, usually measured in watts. Higher wattage often indicates a more powerful motor capable of blending tougher ingredients efficiently.

3. Ergonomic Design: Hand blenders are designed with an ergonomic handle for comfortable and easy grip during use. The handle is typically designed to be lightweight, allowing for convenient maneuverability and control.
   

4. Detachable Blending Shaft: Most hand blenders have a detachable blending shaft or wand. This feature allows for easy cleaning and storage, as the shaft can be separated from the motor unit.

5. Blending Blades: The blending shaft of a hand blender usually contains stainless steel blades at the bottom. These blades are designed to efficiently blend and puree ingredients. The number and configuration of the blades may vary across different models.

6. Versatile Attachments: Some hand blenders come with additional attachments or accessories, such as a whisk attachment or a chopper attachment. These attachments expand the functionality of the hand blender, allowing it to perform tasks like whisking, chopping, or grinding.

7. Easy Operation: Hand blenders are generally easy to operate, typically featuring a simple on/off button or a trigger mechanism that controls the blending function. The speed settings are often adjusted using a dial or buttons located on the handle.

8. Easy Maintenance: Hand blenders are designed for easy cleaning and maintenance. Most models have detachable parts that are dishwasher safe or can be easily cleaned by hand using warm, soapy water.

9. Compact and Space-Saving: Hand blenders are compact in size, making them ideal for small kitchens or for those with limited storage space. They can be easily stored in a drawer or cabinet when not in use.

10. Versatile Use: Hand blenders are versatile kitchen tools used for various tasks such as blending soups, sauces, smoothies, baby food, and more. They can be used directly in pots, bowls, or containers, eliminating the need for transferring ingredients to a separate blender.