WCH BLE 5.4 RISC-V MCU, 1.7–3.6 V, QFN-28 4×4 mm with exposed ground pad; datasheet V1.8 pinout and package dimensions.

Battery-powered CH592-family BLE electronic shelf label with a 2.13-inch SSD1680 E-Ink interface and sleep-disabled 15 V refresh rail.