Hair clipper chargers can have a variety of features, depending on the specific model and brand. Some common features that you may find in hair clipper chargers include:

1. Compatibility: A hair clipper charger should be compatible with the specific model of hair clipper that you have.

2. Charging speed: The charging speed of the hair clipper charger can vary depending on the brand and model. Some chargers may have a fast charging feature, allowing you to charge your clipper in a shorter amount of time.

3. Voltage and current rating: The voltage and current rating of the charger should match the specifications of your hair clipper to ensure safe and effective charging.
   

4. Cord length: The length of the cord can vary depending on the charger model. A longer cord may be more convenient if you need to use the clipper while it is charging.

5. LED indicator: Some chargers have an LED indicator light that shows when the clipper is charging or fully charged.

6. Overcharge protection: Some hair clipper chargers have built-in overcharge protection, which prevents the clipper from being overcharged and potentially damaging the battery.

7. Portability: Some chargers may be more portable than others, with features such as a compact design or a detachable cord.

Overall, the features of a hair clipper charger will depend on the specific model and brand, and the needs of the user. It is important to ensure that the charger is compatible with your clipper and has the necessary safety features to ensure safe and effective charging.