For Pico Bluetooth dual-mode expansion board is an expansion board with Bluetooth 5.1 dual-mode function, universal serial port AT control, support SPP and BLE. It can be used with Pico for to realize Bluetooth wireless communication application. Onboard for Pico interface, suitable for Pico series motherboards. It is suitable for Pico series motherboards, soldering female headers, can be directly connected to the Pico motherboard, and supports stacking use. UART interface communication, general serial port AT control, can get started quickly. Product Name: Pico Bluetooth Expansion Board Bluetooth module: dual-mode Bluetooth to serial port module Transmission distance: 30 meters (open area) interface UART interface Antenna: Onboard PCB Antenna Transmission buffer: The UART buffer of the module is 1K bytes, and it is recommended that the transmission of SPP should not exceed 512 bytes at a time Serial port baud rate: 13 baud rates can be set, the default is 115200bps Input voltage: 5V/3.3V Working current: Instantaneous current at startup: about 25mA, lasting about 300ms; steady state current: about 6mA, not in low-power mode; see the manual for low-power mode current Product size: 56.5x21mm Colour: blue Material: PCB Package Contents: 1 * Pico Bluetooth expansion board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.