1. Power off/pause button/return to the main interface. Long for 2 seconds to power off/on. During the power on process, short to pause the real-time data. Short again to continue the real-time data.Short this button in any interface except the main interface to return to the main interface function (pause or real-time reminder) 2. Page button Short to cycle through three function interfaces Real-time Greaterthan Maximum value + Average value + Total Greaterthan Bar graph (with interface navigation bar)When switching to the other two interfaces, it stay for a long time unless you switch back or short 1 to return to the main interface 3. Mute/vibration button/screen off Short to cycle through reminder modes: sound reminder only-vibration reminder only-sound vibration reminder-sound vibration reminder-sound vibration reminder-sound vibration reminder-off reminder This button is only valid in interface 1 and interface 2, This button has no function in other interfaces (since other pages do not display sound and vibration reminder icons, other interfaces do not have the function set by this button)Long to turn off the screen, short any button during the screen off process to light up the screen 4. Set alarm value Short to enter the alarm value setting: short once for maximum value alarm, short again for total amount alarm. Long in these two interfaces to enter the setting, the alarm value flashes during setting, 5. Short the page key to select the alarm value. Short again to save and exit. In the 4 interfaces, if there is no operation within 5 seconds or the 1 key is pressed shortly, the current settings be saved and exit to the main interface. This button has no function in other interfaces (since other pages do not display sound and vibration reminder icons, other interfaces do not have the function set by this button) Long to turn off the screen, short any button during the screen off process to light up the screen Colour:Grey Material:aluminum alloy Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * detector 1 * cable 1 * English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.