1: 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. 2: It can be used with Pico for to realize Bluetooth wireless communication application. 3: Onboard for Pico interface, suitable for Pico series motherboards. 4: It is suitable for Pico series motherboards, soldering female headers, can be directly connected to the Pico motherboard, and supports stacking use. 5: 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 Model Number: Pico expansion board Type: Bluetooth Module Compatible With:for Type:wireless communication modul Demo Board Type: Arm color:Blue Material:PCB size:56.5 x 21mm Package Contents: 1 x Expansion Board Only the above package content, other products are not included. Note: Light reflection 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.