[Carrier frequency]：2.4~2.518GHz
[Transmit power]：11dBm
[Communication distance]：130m
[Size]：12*19mm
[Introduction]：E34-2G4D11S is a wireless data transmission module that supports full-duplex communication, working in the 2.4~2.518GHz frequency band, TTL level output,using serial port for data transceiver and transmission, reducing none The threshold of line application.
Pin serial number | Pin name | Pin orientation | Pin use |
| 1 | M0 | Input (very weak pullup)） | In conjunction with M1, the module is determined by 4 modes of operation (not dangling, if not used grounded) |
| 2 | M1 | Input (very weak pullup) | In conjunction with M0, the module is determined by the four modes of operation (not dangling, if not used grounded). |
| 3 | RXD | input | TTL serial input, connected to an external TXD output pin. |
| 4 | TXD | output | TTL serial output connected to an external RXD input pin. |
| 5 | AUX | output | Used to indicate the operating status of the module (can be suspended) The user wakes up the external MCU and outputs a low level during power-on self-test initialization. |
| 6 | VCC | - | The module power supply is positive reference with a voltage range of 2.5 to 3.6V DC |
| 7 | GND | input | Module ground |
| 8 | RESET | input | Module reset pin, active low |
| 9 | NC | Reserved feet |