The ASR390E from Abracon LLC is a SAW Resonator with Frequency 389.9 to 390.1 MHz, Centre Frequency 390 MHz, Insertion Loss 1.2 to 2 dB, Capacitance 2 to 4 pF, Quality Factor Loaded 1800. Tags: Surface Mount, SAW Resonator. More details for ASR390E can be seen below.