✔️ Number of flashes: Flashes are the quick bursts of light that the lamp in a hair removal device produces to treat an area of skin. ✔️ Automatic light intensity adjustment: If you’re nervous about trying laser hair removal at home, shop for devices that automatically detect your skin tone and adjust the light intensity level. ✔️ Safety features: Some devices have sensors that won’t flash if your skin tone is too dark or if the device is not held properly against the skin.