1 - MCT-441 ENGLISH 1. INTRODUCTION The MCT-441 is fully supervised indoor, easy-to-install, PowerCode Gas detector. The MCT-441 is a natural gas detector designed to send an alarm when Methane gas is detected. The detectors can be used in a house, apartment, caravan, mobile home or yacht. The detectors are powered by 220 VAC. An internal Lithium battery is used for AC power failure reporting only (the battery does not power the detector). The detector can send the following messages to the alar