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The TK100 at an angle: a black board with a wide gold border, a white two-pin speaker socket on the back edge between AUDIO + and AUDIO -, the eight-legged NS4168 in the middle, a small jumper printed L/R, two round LEGO holes, lonely binary up the left edge, and six right-angle pins out of the front edge printed GND, 3V3, LRCLK, BCLK, DIN and CTRL.
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View it in VR

This board opens in a VR headset: life-size, or big enough to stand beside, with every pin and every part named where it sits. Open this address in the browser on a headset such as Apple Vision Pro or Meta Quest.

learn.lonelybinary.com/vr/tk100
You have this

I2S Amplifier

An NS4168 I2S amplifier on a TinkerBlock board: the ESP32-S3 sends sound as numbers on three wires and the chip drives a 4 Ω speaker, about 1 W on 3.3 V. CTRL must be driven HIGH or it stays off, the L/R jumper picks which channel the mono chip plays, and neither speaker wire is ground.

Supply
3.3V, as printed
Into 4 Ω
1.2W at 3.6 V, datasheet
CTRL
HIGHto play; LOW or open is off
Speaker
4Ω 3 W, in the kit
Start here · 01 Numbers in, sound outOpen the board in 3D

Every pin and part: the three I2S lines into the NS4168, CTRL through 22 kΩ, the L/R jumper that picks the channel, and the two speaker outputs.

Product questions & answers ↓

The rest of the kit

All three blocks come in the one I2S audio kit. The microphone records, the amplifier drives the speaker, the DAC feeds headphones or powered speakers; the harder builds join two of them.

You have this3.3V, as printedI2S AmplifierInto 4 Ω: 1.2 W at 3.6 V, datasheet
See this board 3.3V, never 5 VPDM MicrophoneSensitivity: -26 dBFS at 94 dB SPLSee this board 2.1V RMS, line levelI2S DACSupply: 3.3 V only, never 5 V
The whole handbook9 articles · 45 minQuick referencePDF · 380 KBModel (GLB)GLB · 2.3 MBCAD (STEP)ZIP · 1.6 MBNS4168 datasheetPDF · datasheet.lcsc.comPinout and specsThe pin table, and the questions people ask first
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I2S Amplifier

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Take it with you

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.