Monitors Methane or Isobutane or Hydrogen in the Air. (Please indicate your preferance in order). ? SALES POINT Alert Method : Buzzer / Lamp Brink / Vibration IP Protection : IP54 Pocket Size Small and Compact design Specification Methane or Isobutane or Hydrogen (indicate your preference in order) : Oxygen Measuring Range : 0-100 %LEL Minimum range : 1 %LEL Alert : 1st Alert : 10 %LEL, 2nd Alert : 25 %LEL Alert Method : Buzzer / Red Lamp Brink / Vibration IP Protection : IP54 Operating Range : -20 to 50 degreeC (30 – 85%RH) Power Supply : Alkaline AAA battery x 1 Explosion Proof : Exia ? CT3 Size : W86 x H40 x D20mm Weight 63g