This is what GROHE says about this product:

Go for a shower system that offers great features and more showering space for an easy update to your existing bathroom. This GROHE Vitalio Start 250 Cube thermostatic shower system gives you all this, plus all the benefits for convenience and comfort that a thermostat offers. This exposed system for wall-mounting consists of a Vitalio Comfort 250 Cube head shower, a Vitalio Start 100 hand shower, thermostat, shower rail with 390mm swivable shower arm and gliding element to adjust the hand shower, plus a 1750mm VitalioFlex Comfort Twistfree hose. The 250mm head shower offers a gentle, relaxing Rain Spray. The 100mm hand shower comes with a ShockProof silicone ring to protect it against drops or knocks. It has 2 spray patterns, the soft Rain and the powerful, targeted Jet Spray. Both showers feature water-saving GROHE EcoJoy – limiting flow to 9.5l/min on the head shower and 5.7l/min on the hand shower – for reduced water consumption but the same great performance. GROHE DreamSpray ensures that the flow from each and every nozzle will be just right, making your shower as comfortable and enjoyable as can be. The SpeedClean nozzles are designed to brush free of limescale with a simple wipe. The shower system delivers water at a constant temperature with no nasty surprises, thanks to GROHE’s TurboStat technology. For scalding protection the GROHE SafeStop override button is set at 38°C to prevent especially children from unintentionally turning up the water temperature too high.