52mm Acoustic Buzzer - Black. The acoustic dual-tone buzzer is in black and mounts like other ViewLine gauges in a standard 52mm hole. Series: ViewLine. Function: Buzzer. Type: Multifunction. Input Signal: 12V/24V. Installation Dimension: 52.0 mm. Applications: Boats, Ships, Yachts. Material: Plastic. Compact design for marine use, includes 1 item per package. Package dimensions: 4 x 3 x 3 inches. Package weight: 0.25 pounds. This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.