? 6,1 cm ( 2,4 inch ) 240 x 320 color screen with intuitive user interface - Drop-resistant height of 1.8 meters, sturdy and durable. - Built-in dual-band Wi-Fi 6 (2.4GHz/5GHz) delivers superior antiinterference capability and faster speeds. - Support IEEE802.11k/v/r roaming - Support WPA / WPA2-PSK and 802. 1X EAP encryption to ensure communications security - Built-in Bluetooth 5.0 can be used to connect wireless earphone - Supports batch deployment: One device connects to the network, and multiple devices can share access without passwords.