Yes, you can preview and shoot via the app on your phone. 

Thank you for contacting us. This portable CO gas monitor can freely set the concentration of the alarm value. The sound can be turned on or off The operation is as follows: In the test interface short press the button to turn off the sound (the default is to turn on the sound at boot), at this time the speaker pattern in the upper left corner of the screen disappears. Short press the button again to turn on the sound again." 

Touch up and down with your finger 

Per abbassare o alzare il volume bisogna utilizzare le due frecce verso il basso o verso l'alto, dovrebbero esserci 5 o 6 livelli di volume. Per quanto riguarda la batteria mi sembra abbastanza buona, ovviamente se il display rimane sempre acceso in modalità video, allora la durata diminuisce in maniera simile ad un cellulare che riproduce video in streaming (oserei dire). 

This does not come with a remote control. You need to manually click the buttons to change the brightness and colour.