Main Features: * Easy to installation and operate * 433.92MHz radio frequency * 12 selectable musical tones * Water-resistant Bell Push * Approx. 50 meters (in open space) operational distance * Multiple digital codes to effectively avoid interference * Low power consumption, 6-month battery life to 10 activation per day Specifications: * Musical tones: 12 selectable * Flashing light: Blue light * Battery power: 3*1.5V AA (Main Unit); 1*12V A23 (Remote Control)