... : DC 12V Distance: 100-150m opening area(transimitter& reciver) Freqency: 315mhz/433mh Features:. DIY wireless installation, easy to operatioed, auto-alarm ... , standard voltage). sound frequency: 3.8kh2+10. wireless frquency: 433mhz or 315mhzInstallement and operation:. code preset by factroy, if no, please ...