Gundam Marker GM21? What is this used for? : rGunpla

gm21 infoAd Date Ad 1230975801 · Brand General Mobile · Model GM 21 Plus · Color Black · Storage Capacity 64 GB · Screen Size 6.5 inch · Rear Camera 161 Kenworth T2000 18 Wheelers Semi B88 P1108 GM21 GM25R 692075 Key Blank · T2000 with day lht door · Various 2011 models · Various locks using key codes between:.