Hardware specifications
1. Chipset: ESPRESSIF-ESP32-S2
2. Flash: 4MB
3. Static SRAM: 8MB
4. SRAM: 520 kB SRAM
5. Buttons: power switch, base, start, custom
6. External device: TF card
7. USB to TTL: CH340C
8. Modular interface: SD card, UART, SPI, I2C, PWM, I2S, ADC
9. Vehicle clock: 32.768KHz crystal oscillator
10. Working voltage: 2.7V to 3.6V
11. Operating temperature range: -40 degrees Celsius ~ + 85 degrees Celsius
12. Dimensions: 63 x 30 x 6.6mm
13. Weight: 7g

Power Specifications
1. Power input: USB 5V / 1A
2. Charging current: 500 mA
3. Battery input: 3.7-4.2V
4. JST connector: 2-pin 1.25mm
5. USB: Type C USB

WiFi
1. Standard: FCC / CE-RED / IC / TELEC / KCC / SRRC / NCC (esp32 chip)
2. Protocol: 802.11 b / g / n (802.11n, speed up to 150Mbps, A-MPDU and A-MSDU aggregation, support 0.4uS guard interval
3. Frequency range: 2.4GHz~2.5GHz (2400M`2483.5M)
4. Transmit power: 22dBm
5. Communication distance: 300m