This product is either discontinued or we cannot get that from suppliers.
Qnap RAM-2GDR3LA0-SO-1866, Memory 2 GB, DDR3L SDRAM, Speed 1866 MHz, Device Supported Notebook, Number of Pins 204, Form Factor SoDIMM.
The 2GB 204-Pin 1866 MHz SO-DIMM DDR3L RAM Module from QNAP is designed to run at 1866 MHz frequency. The 204-pin module is compatible with the TS-x53B series.