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High-Speed LB-LINK BL-M8821CS1 WiFi 5 SDIO Module for Seamless Connectivity. High-Speed Dual-Band WiFi: Supports 2.4/5GHz bands with up to 433.3Mbps data rate via IEEE 802.11ac. Integrated Bluetooth 4.2: Combines WiFi SDIO and Bluetooth UART interfaces for versatile connectivity. Long-Range Connectivity: Features external antenna with 14dBi gain for stable, high-rate transmission. Wide Compatibility: Backward compatible with IEEE 802.11a/b/g/n/ac standards. Global Certifications: Passed FCC, CE, RoHS, and ISO9001 for international market compliance. OEM/ODM Support: Factory offers customization for interface, standards, frequency, and antenna.