The modular design of CELLROLL makes a flexible production scale-up possible. Depending on needs, one motor unit can control up to eight bottle racks, each rack accommodating two standard roller bottles. The moisture-resistant motor unit is available with rotation speeds of either 1rpm to 2rpm, or 2rpm to 6rpm and is steered by a programmable control unit located outside of the incubator. Unit alarm system is activated in case of power failure or accidental disconnection of control and motor.