Keyestudio Smart Little Turtle Robot V3 Manual page 198

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Insert a Bluetooth module, LED indicator of Bluetooth module will flash.
Next to download the App.
Special note: RXD, TXD, GND and VCC of Bluetooth module are
respectively connected to TX, RX, - （ GND） and + （VCC） . The STATE and BRK
pins don't need to be connected.
The pin G, V, SDA and SCL of dot matrix are linked with G, 5V, A4 and A5
separately. Plug power to BAT interface.
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