A-Rival NAV PNS 50. GPS Performance: Handheld/Fixed, Internal. Map: 2D, 3D. Display: 127 mm (5 "), 480 x 272 pixels, TFT. Memory: flash, microSD. Energy management: Lithium Polymer (LiPo). Operating system/software: Windows CE 6.0, maptrip 2.6. Other features: SiRF Atlas V, USB, 12 - 24V