Low-profile ceramic glass with matching rear frame. Textured glass surface helps minimize fingerprints and protects the glass finish. 30 in. Model (CTI304D) features four cooking zones. Total cooktop power of 7200 watts. Precise touch-sensitive electronic controls with 11 power settings (includes 3 pre-set options). Full range of power on all zones. NO power sharing or cycling between zones. AutoPanSizing feature senses pan size and matches heat transfer to the pan - no residual heat loss. Most energy efficient cooking method which equates to lower energy costs and cooler kitchens. AutoOff feature that will turn the cooking surface off within 30 seconds if pan is removed or it senses a non-conductive pan is present. Cool to-the-touch cooking surface - safest cooking method to use around children. Shallowest rough-in box depth in the industry - maximizes cabinet storage. All Wind Crest products are UL and CUL listed.