Check the listing for details. L293D Stepper Motor Driver Shield Module Expansion Board Arduino Mega2560. Condition: New. Listed at 12.99 USD. L293D is a monolithic integrated, high voltage, high current, 4-channel driver.Basically this means using this chip you can use DC motors and power supplies of up to 36 Volts, thats some pretty big motors and the chip can supply a maximum current of 600mA per channel, the L293D chip is also what's known as a type of H-Bridge. The H-Bridge is typically an electrical circuit that enables a voltage to be applied across a load in either direction to an output, e.g. motor.- 2 interface for 5V Servo connected to For high-resolution dedicated timer - no jitter!- Can drive 4 DC motors or 2 stepper motors or 2 Servo- Up to 4 bi-directional DC motors with individual 8-bit speed selection- Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil or interleaved stepping.- 4 H-Bridges: per bridge provides 0.6A (1.2A peak current) with thermal protection, can run motors on 4.5V to 36V DC- Pull down resistors keep motors disabled during power-up- reset button- 2 external terminal power interface, for seperate logic/motor supplies- Tested compatible for Mega, Diecimila & Duemilanove - The cheapest shipping service is First-Class Package Service, a domestic mail service offered by USPS. It is designed for mailing lightweight packages that weigh up to 15.99 ounces and offers delivery in 1-5 business days. It includes features such as USPS Tracking, which allows customers to track their packages and receive delivery confirmation. USPS prices start at $4.75, but we don't have any control over shipping prices. - Many customers ask if they can ship their products in an envelope. Unfortunately, we cannot ship merchandise in a paper envelope because it requires extra protection, and USPS does not provide a tracking number for this type of service.