... Antenna interface, internal Wireless Frequency 433.92Mhz Worn Panic Button Transmission Dist. 60meters in open air. Wireless Detectors Transmission ... Pigeon is a professional GSM Wireless Alarm, GSM Home Alarm System, GSM SMS Alarm, GSM SMS Controller, GSM Home Automation ... Logger, GSM Telemetry, Temperature Measurement Logger, Power Monitoring Alarm, GSM M2M Products Manufacturer since 2005. Based on ...