The m² multi is an electronic automatic activation device, operating on the principle of pressure reading. The primary means of detecting the altitude and fall rate is a pressure sensor. The altitude is calculated based on the difference between the two atmospheric pressures. The pressure at current altitude and pressure on landing location “GROUND ZERO”. The pressure on the landing location is measured and set after switching on the device during calibration. This pressure is automatically adjusted by a change in barometric pressure during the day without the need for user intervention. The m² multi checks the ambient barometric pressure every 32 seconds and it determines whether the aircraft has taken off. If yes, it begins to monitor the skydiver’s altitude and fall rate. The pressure sensor measures the atmospheric pressure 8 x per second in free fall.

The information collected is evaluated by means of a microprocessor and ingenious software and it is converted to a real fall rate and altitude. Thanks to this, the m² multi-device is capable of meeting the preset criteria of fall rate in combination with altitude above the landing location, cut the reserve parachute closing loop by means of the cutter and thus initiate the deployment sequence.

The device is activated only in the case the preset criteria are met; the criteria differ depending on the set profiles – STUDENT (Stu), INTERMEDIATE (Int), PROFESSIONAL (Pro), CANOPY PILOTING (Cpi) and TANDEM (Tan)