Max. Output Level: 1.8V Max. Contact Resist.: 100 ohms Tones: 8 total, 4 selectable; 512 Hz Burst/steady, slow whoop, siren, mechanical bell, Klaxon, night ringer, double chime, & doorbell Priority: Four levels Controls: Level Connector: 5-position barrier strip Dimensions: 1-3/8" W x 3-1/8" H x 3-1/2" D Weight: 2 oz.