Technical Data 1. Flashing heart & pulse line, chick’s heart is beating. 2. Black heart & flat line, no pulse. 3. Animated bird, chick is moving. 4. Flashing battery, replace battery. 5. 3-digit number, heart beats per minute. It is a very precise instrument, indispensable for eggs of great value. The monitor has 3 high quality sensors, can be used with raptor eggs. – Power: works with a 9V battery (not included). Instruction Manual