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The TK101 at an angle: a black board with a wide gold border, a gold drawing of a microphone, the tiny rectangular microphone can below it, a jumper and an LED at the top right, two round LEGO holes, PDM MIC up the right edge, and four right-angle pins out of the front edge printed GND, 3V3, CLK and DATA.
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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/tk101
You have this

PDM Microphone

A LinkMems LMD2718T261-OA1 MEMS microphone on a TinkerBlock board that sends sound as one bit per clock pulse. It needs a board with a PDM input, such as the ESP32-S3's I2S0, and 3.3 V. Two signal wires, CLK in and DATA out; ordinary speech reads a few tens out of 32767, so sketches subtract an offset and apply gain.

Supply
3.3V, never 5 V
Sensitivity
-26dBFS at 94 dB SPL
SNR
58dB(A), datasheet
Signal wires
2CLK and DATA
Start here · 01 Sound as single bitsOpen the board in 3D

Every pin and part: CLK in and DATA out through 22 Ω, the L/R jumper held low by 10 kΩ, and the microphone's supply filter.

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.

See this board 3.3V, as printedI2S AmplifierInto 4 Ω: 1.2 W at 3.6 V, datasheet
You have this3.3V, never 5 VPDM MicrophoneSensitivity: -26 dBFS at 94 dB SPL
See this board 2.1V RMS, line levelI2S DACSupply: 3.3 V only, never 5 V
The whole handbook9 articles · 45 minQuick referencePDF · 331 KBModel (GLB)GLB · 1.3 MBCAD (STEP)ZIP · 1.0 MBMicrophone datasheetPDF · lcsc.comPinout and specsThe pin table, and the questions people ask first
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PDM Microphone

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Email us or reply to your order, and quote tk101 — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

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.