Huawei Band 4 Graphite 0.96-inch Android 4.4 Band Watch (Huawei Band 4 Graphite Black) - Resolution: 80 x 160 pixels, Capacity: 91 mAh, TFT colour screen, 3-axis acceleration sensor, Infrared wear sensor, Optical heart rate sensor, Bluetooth frequency: 2.4 GHz, ROM: 384 KB, ROM: 1 MB, Flash: 32 MB, Full screen touch + Home key, USB charging port, Colour: Black