This 20cm long ribbon cable has a 40-way male and a female header connector. Use this cable when using a HAT or other board that doesn't fit in a case, while keeping the Raspberry Pi safely in its case.
The Raspberry Pi Relay Board gives your Pi the ability to control high voltage/high current devices, easily makes normal home appliances become intelligent devices.
The Raspberry Pi 8-Channel Relay Board (B) is an expansion board with 8 relays for Raspberry Pi. It gives your Pi the ability to control high voltage products such as home appliances.
The Li-ion Battery HAT integrates SW6106 power bank management chip, allows providing 5V regulated power supply to your Pi from a 14500 battery, makes the Pi become a portable device.