Methods and arrangements in a first primary device and a secondary device, respectively, for enabling personalized usage of the secondary device by a user of the first primary device. The structure includes a lid encapsulating at least one chip mounted on a chip carrier; at least one seal shim fixed between the lid and the chip carrier, the at least one seal shim forming a gap between pistons of the lid and respective ones of the chips; and thermal interface material within the gap and contacting the pistons of the lid and respective ones of the chips. A second switch 6 blocks passage of a signal of the low band and allows passage of a signal of the high band.