Based on the MRF24J40 chip with some bonus power amp circuitry added, this module gives you everything you need to start immediate work on developing IEEE 802.15.4 (WPAN) with a bit extra power for longer range.  WPAN makes it very easy to communicate, providing addressing, automatic retry and most importantly, collision detection and avoidance.  The result is a very robust, high speed data connection.  It’s a great platform to start experimenting with mesh networks as well - in fact, this module can be used as the PHY/MAC layers of a full Zigbee stack if you wish.