The TLRF-3700M-3980M-S from Talent Microwave Inc is a Band Stop Filter with Stopband Frequency 3700 to 3980 MHz, Insertion Loss <2.5 dB, Rejection 50 dB, Power 5 W, VSWR 1.70:1. Tags: Module with Connectors, Cavity Filter. More details for TLRF-3700M-3980M-S can be seen below.