1Graphical Design: Adopts a 128x64 LCD screen. With a graphical design, the main menu is artistic as well as informative: it can display up to 10 parameters and states. Able to read the historical data of a certain . 2Powerful BLE4.0A Function: A lowpowerconsumption BLE4.0 feature enables more powerful functions when pairing with a mobile APP (optional). 3Controller Abnormality Alarm: Employs two indicator lights to indicate controller abnormalities and communication errors respectively. Features a controller abnormality voice alarm function which can be switched on/ off. 4Monitor Live Data: A backlight time setting function is available. Able to monitor live data and operating statuses of the controller. On/ off switching, clearing of historical data and restoring to factory settings can all be done with this unit. 5Standard Communication Protocol: Adoption of standard for Modbus communication protocol. Features standard RJ12 as the communication interface. 6Simple Power Supply: With no need of an external power source, connection with a controller by means of a data cable will be enough to enable the unit to be powered. 7Anti Interference: Boasts an industrial grade design and excellent antiinterference capacity, the product can function well in various tough conditions. Item Type: Solar Controller Material: ABS Screen: LED LCD display Power Consumption: LCD backlight is on ( 1 x Controller 1 x Manual 1 x Wire 12 x Screw 6 x ScrewSleeve The Bluetooth module needs to be purchased additionally, you can contact if you need it.