Garmin Etrex 30. Form factor: Handheld. Display diagonal: 55.9 mm (2.2 "), Display resolution: 176 x 220 pixels, Display: TFT. Compatible memory cards: microSD. Weight: 0.1417 kg, Width: 54 mm, Depth: 33 mm. Battery technology: Nickel–Metal Hydride (NiMH), Battery life (max): 25 h, Battery type: AA