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A keyboard matrix circuit is a design used in most electronic musical keyboards and computer keyboards in which the key switches are connected by a grid of wires, similar to a diode matrix. For example, 16 wires arranged in 8 rows and 8 columns can connect 64 keys — sufficient for a full five octaves of range.

Features:

1. High quality and new 100% Matrix Keyboard
2. Items: Keyboard Matrix 4X4 push buttons 16 buttons 8 LEDs
3. Keyboard size: 5X6 CM

Package Include:

1. Matrix keyword control panel 4X4 1 pieces
2. 4 pieces screws
3. 4 pillars pieces