Koolertron (TM) For GMC Indash DVD GPS Player Navigation System AV Receiver Car Radio with 7" Touchscreen Monitor + RDS PIP 7.0" 800*480 Digital High Definition TFT LCD touchscreen. Operating system:Win CE 6.0 Built-in GPS navigation receiver,Built in bluetooth:Bluetooth 2.0, support A2DP; Original 2-ZONE function, the back display screen can connect DVD/USB 30 days exchange,One Year limited warranty /SD/TV/RADIO functions while the host display show different contents, without any interference even in voice navigation.