Here are some key features and specifications of the Teensy 4.1 Development Board:

Microcontroller: It is powered by a NXP i.MX RT1062 ARM Cortex-M7 processor, running at 600 MHz. This is significantly faster than many other microcontrollers.

Memory: The Teensy 4.1 has 8MB of Flash memory for program storage and 1024KB of RAM for data storage.

I/O Pins: It provides 55 digital I/O pins, 3 analog inputs, and numerous communication interfaces like SPI, I2C, UART, and more.

High-Speed Interfaces: Teensy 4.1 supports USB High-Speed (480 Mbps), Ethernet, and CAN bus for various connectivity options.

Display Support: It has a parallel LCD interface, and it's compatible with several display libraries.

Expansion: The board includes two microSD card slots, which can be useful for data logging or storing large amounts of data.

Audio Capabilities: Teensy 4.1 features high-quality audio processing capabilities with a high-speed audio interface and support for audio libraries like the Teensy Audio Library.

Size and Form Factor: The board is compact and designed to be compatible with standard breadboards.

Power Supply: It operates on 3.3V and can be powered via USB or an external power supply.

Development Environment: You can program Teensy 4.1 using the Arduino IDE with the Teensyduino add-on. PJRC also provides additional libraries and tools to make development easier.