The number of different lengths that the device can use.

Shavers that can be used when the skin is wet e.g. in the shower and when the skin is dry.

The colour e.g. red

The material e.g. metal from which the blade of a knife

What is providing power for the product e.g. mains electricity.

The device can be connected to a power supply in order to restore electrical energy in the battery.

The type of battery in the device

The voltage (V) of the battery.

The amount of time needed to charge the product.