The micro:bit CLUB is a class pack, with 10 each of micro:bit modules, battery packs with batteries, and USB cables, in bulk packaging.
The micro:bit has quickly become a favorite tool for early discovery of physical computing by younger students. The micro:bit GO bundle (mb158-US) includes a single micro:bit module, battery pack with batteries, and a USB cable. The micro:bit CLUB is a class pack, with 10 each of micro:bit modules, battery packs with batteries, and USB cables, in bulk packaging. For example, if you need 23 micro:bit sets, get two CLUB bundles and three GO bundles!
The micro:bit hardware is a single board computer with enough capability to be used for games and applications. The 5×5 LED matrix, buttons, accelerometer, magnetometer, and Bluetooth radio provide enough sensors and communication devices for a number of projects. The I/O pins, power and ground are accessible with alligator clips (so you can turn a banana into a pushbutton, for example). Its 20-pin edge connector fits with the Parallax cyber:bot board for robotics – coming soon!