The SLS CYPRES 2 control unit is unlike any of the other CYPRES models. Its display simply consists of one white LED and one red LED. Prior to boarding, the crew responsible for the gear performs a self-test via one press of the Self-Test Module button. The module then communicates with all SLS CYPRES units in range, causing them to perform individual self-tests. If the CYPRES unit does not detect a problem, the white LED begins flashing every 5 seconds. If an error is detected, the red LED remains solid for 3 minutes and then begins flashing red every 5 seconds.
Once aboard the aircraft and at least one minute prior to exit, the jumpmaster switches on the Aircraft Module, which then begins communicating with every SLS CYPRES unit on board. The units then go into working mode and the white LED begins flashing white every 2 seconds. The jumpmaster can then walk by and inspect that each unit is flashing white. The SLS CYPRES units are now ready for exit. For both the initial gear check and process in the aircraft, the individual jumper is not required to do anything with the CYPRES, which takes away a lot of stress from a first-time or relatively new jumper.
Upon exit, the SLS CYPRES is designed to activate approximately 500-600 ft below the aircraft if the jumper has not slowed down to an approximate vertical descent rate of less than 13 m/s.