A. When the water temperature is ≤29c,
  Blue will show automatically;
B. When the water temperature is between
    30c~39c,Green  will show automatically
C. When the water temperature is between
     40c~49c, Red color will show automatically;
D. When the water temperature is ≥53c, RED
     color will flash automatically.
or
1、As the built-in device generating electricity without the battery and any other power connets to water, LED will emit the light.                
2、The light can change one color every 3 to 5 seconds so that the rainbow colors are showing gradually.

1.Weight（N.W）.:17kg

2.Measurement：500*1000*8mm

3.Export Carton Measurement：60*113*20cm

QTY/Carton：1PCS

G.W.:18kg