FrSky TD R12 Receiver 12chnanel with PWM SBUS FBUS or S.Port 2.4Ghz 900Mhz ReceiverThe Tandem (TD) dual band receivers are unlike any other FrSky 2. 4Ghz or 900Mhz receivers, they work simultaneously at both 900Mhz and 2. 4Ghz frequencies. That means TD receivers provide not only low latency signal and long range control but also benefit from the enhanced level of high reliability and anti interference performance.