T-Rex Ultra , Screen 1.39" , Display technology AMOLED , Resolution 454 x 454 , Wireless connections WLAN/Bluetooth , Memory 2.3GB for music , Material Silicone rubber , GPS , Material housing Stainless steel , Colour Black , Battery capacity 500 mAh , Operating System Zepp OS , Dimensions 47.3x47.3x13.45mm , Weight 0.089 kg