Key operation notes: press the spray switch down to start or stop the facial mist (automatic mist every 30 minutes); press and hold the reminder button for 2 seconds to set a 2-hour hydration reminder (indicated by two buzzer sounds and two blue LED flashes; after two hours the device signals with five buzzer sounds and five blue LED flashes); single press of the dedicated button activates the flashlight; double press activates the SOS alert sequence; when energy is low the red LED will blink five times after use, indicating the unit should be recharged. Water Bottles and Flasks