Under the normal display state, long press the “+” button for 3 seconds, the start temperature value flashes, press +/- key to set the value, after 5 seconds without operation, automatically return to the detection temperature display. under the normal display state, long press the “-” button for 3 seconds to stop the flashing of the temperature value. Press the +/- button to set the value. 2. Set the stop temperature: 1. Set start temperature +: The products of our store will be carefully selected before delivery and then delivered to you.If you have any questions, please feel free to contact us. We will usually reply to any message you send within 3 hours or no more than 8 hours.