Frequency Range : DC to 4 GHz
Attenuation : 1dB to 20dB
Accuracy : +/-0.5dB
VSWR : 1.2:1 @ 2GHz / 1.3:1 @ 4GHz
Power Rating : 2.0 Watts

Part number should be as following.
DJAT-04-XX-02T-0A (XX=dB value)