... zon7. Remote control function, with built-in MIC, Monitoring from long-distance.8. Built-in voice module, 10~20seconds record, Voice ... Anti-cutting telephone line.14. Rechargeable battery built-in, can work for 24 hours in case of no electricity supply15. Wireless intelligent learn ... two flat pins, three pins customized 3. Wireless receiving distance in open place: >250m, indoor: 30~50m, (depend on the ...