Hello Plum / Hello Watch4+ 4G Smartwatch Color: Body = Black, Band = Black Device Name: Hello plum Model: Hello watch 4 plus Screen Size: 2.04 inches Screen Material: AMOLED screen, 368 * 448 resolution System: Android system Storage: RAM 2GB + ROM 16GB Body Material: Aluminum case Dimensions: 49.5 * 43 * 14.7mm Charger: Wireless magnetic charging Battery: 400mAh lithium-ion polymer battery Bluetooth: BT 3.0 + BLE5.3 SIM Card: Supported Wifi: Supported 4G: Supported Main Functions of the Watch WIFI, 4G calls and data network, SIM card support, software download, watch face download, breathing training, fitness training, sleep monitor, noise detection, alarm clock, timer, world clock, e-book, 16GB ROM, file management, local music, siren, photo album, Alipay offline payment, stock market, map, NFC door access, multiple sports, navigation, heart rate, blood oxygen, pedometer, mobile phone message notification synchronization (WhatsApp, Facebook, Wechat, etc.), Bluetooth calls, etc. Languages German, Japanese, Spanish, Italian, French, Dutch, Korean, etc.