BL-M8821CS1 is compatible with various system platforms for development and transplantation Low cost, high performance High power, long distance High universality, strong stability, high cost performance Suitable for set-top boxes, projectors, IPC cameras, tablet computers, driving recorders, TV Module Name:BL-M8821CS1 WLAN + BT4.2 SDIO Module Chipset:RTL8821CS Operating Frequencies:2.4-2.4835GHz or 5.15-5.85GHz WIFI Standards:IEEE802.11a/b/g/ac Host Interface:SDIO 1.1/2.0/3.0 Antenna:Connect to the external antenna through half hole Power Supply: 3.3V0.2V Operation Temperature:-20 to +70 Operation Humidity:10% to 95% RH (Non-Condensing) Colour:As Shown Material:PCB Package Contents: 1 * Wireless Module 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.