Flush mounted. Integrated BCU, Fits 55mm systems:- BERKER S1, B3, B7 - GIRA Standard 55, E2, Event, Esprit- JUNG A500, Acreation,AS 500, Merten 1M, M-Smart, M-Plan, M-Pure, Selectable temperature controller (PI, Two-position, PWM), Given value is stored at voltage failure, Bit/Byte object to set the given value, For indoor temperature controlling, range -10 to +50°C, Limit values min/max, frost-/heat protection alarm, min/max memory, Desired value can be given by visualisation, e.g. MDT VisuControl, Day-/night-/frost-/head protection operation, Status feedback by HVAC and RHCC status objects, Operation mode can be set via Bit/Byte objects, Installation with support ring (included in delivery), 3 years warranty.