1) The module adopts ESP-12S, which is based on ESP8266's low-power UART-WIFI chip module; 2) The main frequency supports 80MHz and 160MHz; 3) Spectrum range: 2412-2484MHZ; 4) voltage: DC 3.3v; 5) USB input voltage: DC 5V; 6) Size: SD-24mm x 8.3mm; TF - 24 mm x 45.5 mm; 7) Transmission file name requirements: only support the file name consisting of ASCII code; 8) TF card memory: 128M. type:B Colour:As Shown Material:PC+metal Package Contents: 1 x SD Cloud V1.0 Wireless Transmission Module(Without TF card) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.