Range up to (open air), R&TTE 60 meters, FCC 30 meters. Sounds DingDong(Double), Soft DingDong, DingDong(Single), Melody, SALAM ALAIKUM etc. Frequency 433. 92MHz, 418MHz The wireless system makes installation easy and brings no effect on your interior decoration. The strong digital anti-interference prevents interference between users and misringing Easy to install (No wiring or DC power required) Digital coded radio signal to prevent false triggering Designed to the highest standards to meet requirements of radio telecommunications agencies around the world There are several remotes to choose FCC/CE/R&TTEHS Code: 85318090 Trademark: Kangtai Model: 6898-84 Standard: FCC,CE,R&TTE Productivity: 110,110,000 Unit Price/Payment: USD2.40