1. Alarm swftch: Long press the button to enter the function, short press the up button to turn on/off the alarm switch2. Set the upper limit of temperature alarm: Press the key again to set the temperature upper limit alarm value, and press the up/ to adjust the alarm value3. Set the lower limit of temperature alarm: Press the key again to set the temperature lower limit alarm value, press the up/ to adjust the alarm valueMeasurement range :-40 C~ 150 CProbe length: cord length:1.5mInstructions:Key function description:1. Enter function 2. Up keyAdjust settings and 3. keyAdjust setting value reduction and The order of key function is:1. Alarm switch;2. Set the upper limit of temperature alarm3. Set the lower limit of temperature alarmPlug Type:EU Plug,it applies to Indonesia, Germany, , Spain, and so onMaterial: Plastic + Metalcolour: As shownPackage Contents:1 x Pool Thermometer1 x Probe()Only the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.