Dolphin Exclusive Features:

Electrically self-powered system that uses pool water circulation to generate electricity
Electrical switch operates the driving gear for efficient, quick, and precise maneuvering
Scrubs, vacuums and filters all pool surfaces in just 2 hours
Wall sensor, slope climbing and obstacle avoidance abilities

More:

CleverClean scanning algorithm ensures excellent and efficient pool coverage
Overcomes obstacles such as drain covers, using mechanical and software systems
Self-programmed for optimal pool scanning. 
24 month warranty - spare parts and labor.

DX2 Specifications: