The scalp massager applicator is easy to use and dispenses just the right amount of liquid for hair. No mess with the application. This scalp liquid applicator works great at dispersing liquid right at the scalp. Typically its a challenge getting it on the scalp without it getting in the hair but this device works great helps to keep us from adding too much liquid to the scalp. Nice addition to self care routine. The liquids come out slightly without leaving hair too greasy when rolling it on the scalp. Enjoy having this be apart of our self-care routine. If you get very lazy. This electronic hair liquid applicator makes it very easy for you and gets all the liquid onto your scalp. When you are done just simply charge the device with the charger that is included. It is a big stress and time saver. Product Parameters: Charging voltage: DC3.7V/1A Battery capacity: 250mAh Charging time: 2H Use time: 2H Packing including: 1 * Medicine Applicator 1 * USB Charging Cable 1 * User Manual