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Magic Motion Kegel Master Protocol

Introduction​

The Magic Motion Kegel Master is a BLE-connected pelvic floor biofeedback vibrator with a pressure sensor. It uses the same VT Command Service (write characteristic) as other Magic Motion devices. This page documents the sensor service and the single/multi-argument vibration commands from community reverse engineering.

BLE Profile​

ble_names:
  - "???"
services:
  - uuid: "6f468792-f91f-11e3-a847-b2227cce2b54"
    description: "Vtoy Sensor Service"
    characteristics:
      - uuid: "6f468bfc-f91f-11e3-a847-b2227cce2b54"
        properties: [notify]
        role: rx
        description: "Pressure sensor value"
      - uuid: "00002902-0000-1000-8000-00805f9b34fb"
        description: "CCCD for sensor notification subscription"
  - uuid: "78667579-7b48-43db-b8c5-7928a6b0a335"
    description: "VT Command Service"
    characteristics:
      - uuid: "78667579-a914-49a4-8333-aa3c0cd8fedc"
        properties: [write]
        role: tx
        description: "Vibration command"

Sensor Data​

Notification Subscription​

Write to CCCD (0x2902):

  • 01 00 — subscribe
  • 00 00 — unsubscribe

Pressure Value (1 sensor)​

Returns 2 bytes:

sensor_value = (data[0] & 0xFF) * 256 + (data[1] & 0xFF)

Devices with 2 or more sensors have not been fully documented.

Commands​

Vibration — Single Argument​

04 08 v1 64 00

v1 = intensity, 0x00–0xFF. Values above 100 (0x64) are not recommended (may degrade motor).

Vibration — Two Arguments​

0b ff 04 v2 v2 0a 00 04 08 v1 64 00

Both v2 fields appear to share the same value. Meaning of the second argument is unknown.

Vibration — Three Arguments​

... 04 08 v3 64 01

v3 format is the same as the one-argument packet; relationship between v2 and v3 is unknown.

Notes​

  • Values above 100 (0x64) are explicitly warned against by the original reverse engineer.
  • Multi-argument commands may apply to multi-motor devices; the Kegel Master has only one motor.
  • BLE advertisement name is not documented.

Sources​