1. Containing maps and GPS navigation function 2. Built-in super-sensitivity GPS antenna and GPS sensitivity tracking: -159Dbm 3. Convenient touch-screen operation 4. AV-input: a pair of built-in stereo speaker 5. Expedite menu of operational interface 6. Double-stereo speaker output with earphone port, built-in high-fidelity 1w speaker 7. Volume of earphone and loudspeaker adjustable 8. Auto-adjustable for 12/24v automobile electronic power, Maximum exterior wastage: 8w Average wastage: 5w Waiting wastage: 60mW.