Mini-Circuits ZFM-2-S+ Double Balanced Mixer
1 - 1000 MHz
LO Power +7 dBm
low conversion loss, 5.72 dB typ.
good L-R isolation, 40 dB typ, L-I, 35 dB typ.
wideband, 1 to 1000
https://www.minicircuits.com/pdfs/ZFM-2+.pdf
Sold as seen in the photos.