The Teensy is known as a great value, as it's Arduino-compatible, super-powerful, and has a well-established userbase. The Prop Shield is designed to mate with a Teensy to open it up for use for quicky-builds of props and costumes.

What the Prop Shield brings to the party is this:

• Motion sensors - we're talking the big 11: X/Y/Z Gyro, X/Y/Z Accelerometer, X/Y/Z Magnetometer, plus air pressure (altitude) and temperature.
• Audio Amplification - 2 Watts capable of driving 4~8 ohm speaker loads, allowing for Teensy's speech synth & sound effect.
• Fast LED Driver - 5V buffered outputs for APA102 and other addressable LEDs. And Teensy's speed makes animations smoooth.
• Extra 8MB Flash Memory - Ideal for storing sound clips and datalogging with the serialflash library.

The Shield can be directly soldered to a Teensy, but it is slightly longer. A slight increase in size and thickness results in a HUGE increase in functionality of your Teensy installation!

On a side note, although this is designed for a Teensy, it could be "hotwired" into any 3.3V compatible microcontroller to make use of most (if not all) of these features. It's a real bargain of a board, not be overlooked for adding functionality to your project.

Specifications:

• 3-Axis Accelerometer and X/Y/Z Magnetometer by Freescale FXOS8700CQ
• 3-Axis Digital Angular Rate Gyroscope by Freescale FXAS21002
• Altimeter & Temperature by Freescale Xtrinsic Xtrinsic MPL3115A2
• 2W Audio Amplification by TI LM48310 Boomer IC
• 64MBit (8MB) Serial flash memory by Winbond W25Q64FV
• 3.3V operation

• [Data Sheet]: TI LM48310 Boomer Audio Power Amplifier IC
• [Data Sheet]: Freescale FXOS8700CQ, 6-Axis Sensor with Integrated Linear Accelerometer and Magnetometer
• [Data Sheet]: Freescale FXAS21002 3-Axis Digital Angular Rate Gyroscope
• [Data Sheet]: Freescale Xtrinsic MPL3115A2 I2C Precision Altimeter