The CBack NB-IoT is an NB-IoT communication module adapted to the M5StickC/C Plus series, with a built-in SIM7020G module that covers most of the world\’s Cat-NB frequency band. It integrates the SMA external antenna interface, improves the communication quality, and the signal stability of the device. It supports a variety of common IoT communication protocols (MQTT, HTTP, CoAP, etc.), which is suitable for various low-latency and low-throughput application scenarios. Features Compatible with M5StickC/C Plus series AT command control, UART transmission rate: 115200bps SIM card type: Nano External antenna: SMA antenna SIM7020G national telecommunications certification Specifications Resources Parameters Communication module SIM7020G The Cat-NB band is supported B1/B2/B3/B4/B5/B8/B12/B13/B17/B18/B19/B20/B25/B26/B28/B66/B70/B71/B85 Data transfer speed 126(DL)/150(UL) Network protocols TCP/UDP/LWM2M/COAP/ MQTT/HTTP/HTTPS/ TLS/DTLS/DNS/NTP/ PING/OneNET/Telecom Cloud/Aila Cloud* Communication method UART 115200bps authentication CE*/FCC*/GCF*/PTCRB*/RoHS/REACH/ATEX/TIM*/Deuts Telecom*/Vodafone*/T-Mobile* Product Size 68mm 24mm 21mm Package Size 90mm 35mm 21mm Product Weight 12.2g Package Weight 25g Resources Product Wiki SIM7020 Series datasheet SIM7020 Series_Ayla_Application Note_V1.03 SIM7020 Series_CTBURST_Application Note_V1.01 SIM7020 Series_CoAP_Application Note_V1.03 SIM7020 Series_EAT_Environment & Compilation & Burning Guide_V1.02. SIM7020 Series_FOTA_Application_Note_V1.02 SIM7020 Series_HTTP(S)_Application Note_V1.04 SIM7020 Series_LWM2M_Application Note_V1.03 SIM7020 Series_Low Power Mode_Application Note_V1.05 SIM7020 Series_MQTT(S)_Application Note_V1.05 SIM7020 Series_NVRAM_Application Note_V1.02 SIM7020 Series_SAT_Application Note_V1.01 SIM7020 Series_SNTP_Application Note_V1.03 SIM7020 Series_TCPIP_Application Note_V1.04 SIM7020 Series_AT Command Manual_V1.05 Package Contents 1x CBack NB-IoT CN 1x SMA antenna 2x M2x4 screws