Battery-powered product with lithium-ion battery.
The back of the product can be detached to pour in essence (note that the product is sold without essence).
Three massage modes: fast, slow, and fast-slow combination.
Three levels of micro-current intensity: weak, medium, and strong (note that the current can only be felt when the scalp is wet after shampooing).
Three types of light therapy: blue light, red light, and purple light.
