Dielectric and electrooptic studies of 4′-[(S,S)-2,3-epoxyhexyloxy] phenyl 4-(decyloxy) benzoate (in short EHPDB) have been done and Goldstone mode (GM) and domain mode (DM) relaxation have been observed. The dielectric measurements have been done in the temperature range between 57˚C and 80˚C covering the N*, SmA*, SmC* and a metastable S3phase. Temperature dependences of the dielectric parameters of GM and DM show that the phase known before as S3phase is one of the ferroelectric phases (SmI* of SmF*). The electrooptic measurements have been performed on uniformly aligned samples using polarizing microscope. Temperature dependencies of the dielectric and electrooptic data of the pitch of helix and the critical field for unwinding the helix show that the SmC*-(SmA*)-N*transition is of the first order type.