Diverse-Speaker and Description of Creative D5XM for Smart Phones

Greetings!
I want to know more about sound systems. I eyeing to buy Creative CREATIVE D5XM. What are the best features of this speaker? What are the specifications? What do you mean by A2DP? What is AVRCP and its useful functions to any devices? What is aptX and what are the useful functions of this? What is SBC in wireless technology and for video and audio codecs? What is AAC technology? How is this useful in improving speaker products and sound systems? How much is the cost buying D5XM?
