Promotional products: Our new coaster clock features a unique LCD clock display with vertically stacked digits. Features six round, 4" diameter, brushed aluminum coasters that neatly stack on the acrylic clock post when not in use. Clock displays time, month and date with the touch of the "mode" button. Operates on one button cell battery (L1131) included. All six coasters feature the same logo or message for maximum advertising impact.