Description: Receiver: 2 *No. 5 battery, / emitters: 1 *12 V battery Exchange the bell: 9510 HA, 9520 HA Receiver: 3 V/emitters: 1*12 V battery Functions: 1. Easy to install, without dragging line, 2. Digital quartz crystal, segmentation repeat rate 1/10000, 3. Remote distance can reach 100 M-150 M open 4. Less power consumption, including 1..