Size and fit - Full length 10.4 cm (4.09 in); shower head diameter 5.45 cm (2.15 in) Adjustable modes - Two water output modes: outer ring water output and foaming water output - Outer ring output is suitable for shampooing; foaming output is suitable for rinsing, making the shampooing process easier Handheld design - Handheld shower head designed to boost water pressure in hair salons, helping to make shampooing more comfortable Ease of use - Side switch design for quick mode adjustments - Two adjustable modes to meet different shampooing requirements Use scenarios - In a hair salon, to increase water pressure during shampooing for a faster, more comfortable experience - At home, use outer ring mode for applying shampoo and foaming mode for rinsing to simplify the process - In any shower where adjustable water output is needed to accommodate different shampooing and rinsing preferences