Bluetooth version 3.1, a 1.43-inch IPS display with 466 x 466 resolution, 256 MB of memory, and an additional 1 GB for music storage Features include smart calling, heart rate, blood oxygen, sports mode, always-on display, music storage up to 1 GB, and TWS connectivity. The 300mAh battery is water resistant and IP67. An additional strap is included.