Model CSblue integrates an input coil, a feedback coil, and a heater on the chip. Input and feedback coil are inductively coupled to the SQUID.

The glassfiber reinforced plastic package has dimensions of 13×7.5×2 mm (L×W×H). On top are four pairs of solder terminals available with metal wire bond connections to the SQUID, the feedback coil, input coil, and to the heater resistor. This resistor allows an easy expelling of frozen flux in the SQUID loop and input circuit.

A summary of the main parameters:  

Characteristics
Size of superconductive screen in mm	24×ø10
Input inductance in nH	320
mutual inductance input coil-SQUID MIN in nH	10
mutual inductance feedback coil-SQUID MFB in pH	230
current noise better than, in pA/Hz1/2	1.5