The 4PR7-1227.4/1575.4-S11 from Reactel is a Band Stop Filter with Stopband Frequency 1.2274 to 1.5754 GHz, Bandwidth 15 MHz, Insertion Loss 0.8 to 3 dB, Rejection 60 dB, Power 200 W. Tags: Module with Connectors, Notch Filter. More details for 4PR7-1227.4/1575.4-S11 can be seen below.