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The ESP32-C3 OLED screw terminal base seen from above at an angle: a black board with a green eight-way screw terminal block down each long edge, numbered 3 to 10 on the left and 0, 1, 2, TX, RX, 3V, GND and 5V on the right, two black sockets between them for the ESP32-C3 OLED board, a white JST battery socket at the bottom, and a slide switch and two mounting holes at the top.
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You have this

ESP32-C3 OLED Screw Terminal Base

A 25 × 20.5 mm ESP32-C3 board with a 72 × 40 OLED already wired to GPIO 5 and 6, and three bases it seats on, each with a battery connector, charger and switch: 2.54 mm pins, push-in terminals or screw terminals.

Holes out
16
Terminals
2 × 8at 3.5 mm
Mounting holes
Ø4.8mm, 16 mm apart
Start here · 14 The screw terminal baseOpen the base in 3D

Turn it over, click any terminal, and see which GPIO it is, what already has it on the board, and how to wire a module to it.

Product questions & answers ↓

The ESP32-C3 OLED and its three bases

One ESP32-C3 OLED board, three bases it seats on: 2.54 mm pins, push-in terminals or screw terminals. Each base carries the same battery connector, charger and power switch.

See this board 72 × 40pixel OLEDESP32-C3 OLED Development BoardChip: 160 MHz RISC-VSee this board 16GPIO and power, brought outESP32-C3 OLED Expansion Base (2.54 mm)Each side: 8 + 8 pins and sockets at 2.54 mmSee this board 2 × 8at 3.5 mmESP32-C3 OLED Pluggable Terminal BaseBase size: 53.1 × 32.5 mm
You have this16ESP32-C3 OLED Screw Terminal BaseTerminals: 2 × 8 at 3.5 mm
The whole handbook17 articles · 100 minQuick referencePDF · 627 KB3D model (GLB)GLB · 3.6 MBCAD model (STEP)ZIP · 3.3 MBDrawing (DXF)ZIP · 204 KBDrawing (PDF)PDF · 2.8 MBPinout and specsThe pin table, and the questions people ask first
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ESP32-C3 OLED Screw Terminal Base

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ESP32-C3 OLED Screw Terminal Base
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Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.