Emergency Button FCC USER MANUAL GUANGDONG ROUE ELECTRONICS CO., LTD. This product is compatible with R-0503 series, R-0507 series and R-0506 series of Roue, as an emergency alarm or a prompting when in emergency. The alarm host will issue a set sound by simply pressing the “SOS” button when in emergency. Outdoor Unit (transmitter) Power av Working current <10mA Standby current < 45uA Transmission range(open air) =80m Wireless transmitting frequency 433.