1.37 cm IPS LCD 5D arc capacitive touch screen, easy to operate. Built-in SIM card slot and TF card slot. NFC: No need to search, Bluetooth pairing, electronic business cards. High compatibility with all Android smartphones and Android tablets. Such as Samsung, HTC, Sony, LG, Huawei, ZTE, OPPO, XIAOMI, etc. It can use or not use a SIM card. With SIM card, it supports 2G GSM 850/900/1800/1900 MHz network. It is a GSM mobile phone. Without a SIM card, it can be used as a mobile phone companion to synchronize your mobile phone via Bluetooth. More functions: Bluetooth dialer, pedometer, sleep monitoring, sedentary reminder, music player, alarm clock, watch, camera, remote camera, Bluetooth SMS/instant message notification, message reminder, incoming call reminder, answering calls, dialingcalls . Two-way loss prevention. Anti-theft reminder two-way search, you will never lose your phone.