The heavy-duty 2-pack: a large keypad in a black rigid frame with raised keys, plugged into its small black adapter below, a second keypad and adapter beside it, and the teal I2C MATRIX KEYPAD KIT box.

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4x4 Matrix Keypad with I2C Adapter, Heavy Duty, 2-Pack

A 4×4 keypad on two I²C wires instead of eight GPIO pins. The TK85 adapter, the soft and heavy-duty keypads, the two keymaps they need, and how to put two on one bus.

In the box: 2 + 2keypads + adapters
Signal wires: 2SDA + SCL
Supply: 3.3 / 5V, your board's
Address: 0x20as shipped

Start here · 01 Sixteen keys, eight wires The reference

Product questions & answers ↓

The whole handbook11 articles · 50 min DatasheetPDF · ti.com Pinout and specsThe pin table, and the questions people ask first

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4x4 Matrix Keypad with I2C Adapter, Heavy Duty, 2-Pack

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4x4 Matrix Keypad with I2C Adapter, Heavy Duty, 2-Pack

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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.