What communication capabilities does the Waveshare mini-computer offer?

It adopts the SIM7600G-H global 4G/3G/2G communication module, allowing for various cellular connectivity options.

What types of Raspberry Pi modules is this mini-computer compatible with?

This mini-computer is compatible with Raspberry Pi CM3, CM3 Lite, CM3+, and CM3+ Lite.

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Waveshare Compute Module Industrial IoT Mini-Computer with 4G Connectivity and PoE Feature for Raspberry Pi CM4S/CM3/ CM3+ Series

Compatible with Raspberry Pi CM3 / CM3 Lite / CM3+ / CM3+ Lite
Adopts SIM7600G-H global 4G/3G/2G communication module
10/100M auto-negotiation Ethernet port, with PoE enabled. Supports 2.4GHz WiFi wireless connection
USB HUB and USB TO UART, allows connecting more USB devices
Provides various industrial isolated interfaces: CAN/RS485/RS232/ADC/GPIO/RTC.Onboard multi video/audio ports like HDMI/DSI/CSI