1. GP4 supports SMS control, APP control, AI/DI with remote linkage actions. It supports 4-way relay output (10A NO&NC), 4-channel digital input (dry-contact), and 4-channel current acquisition (4-20mA). It operates with a wide input voltage range of 9V to 24V. It is suitable for access control, building automation, and automatic industrial systems. 2. GP4-WLTE is a 4-channel DI/DO/AI 4G remote controller. The controller includes 4 channels of Digital Input (DI), Digital Output (DO), and Analog Quantity Input (AI). The DI supports dry contact detection; DO provides relay output with a control ability of 10A at 250VAC or 15A at 30VDC. The 4 channels of AI input support 4-20mA current input, with an accuracy of 12 bits. GP4 supports 2 control methods: APP and SMS. 3. GP4-WLTE is an IO controller that utilizes the 4G network for control. The primary control is through the "WLTE Control" app, which can be easily found in the app market. This app allows for convenient parameter configuration and linking to the Digital Output (DO) relay for complex automation control logic. 4. Another control involves using SMS, which can perform simple Digital Output (DO) control. Additionally, SMS alarms can be set. For instance, when the analog liquid level reaches the configured threshold, GP4 will send an alarm message to your phone. 5. Each of the 4 channels of relay output has an indicator, allowing immediate identification of the output state. GP4 operates within a working voltage range of 9-24V DC, making it well-suited for various industrial control environments. Type:Smart 4G Controller Model:GP4-WLTE () All the kits include DC12V power adapter and external antenna. But no sensor. Remote control via 4G Mobile data network or SMS. 4 channels of analog quantity input: Supports 4 channels of 4-20mA input. 4 channels of digital quantity input: Supports passive switch values (dry contact). 4 channels of digital quantity output: Equipped with relay output (10A@AC250V/DC30V). Note:This device only support 2G/4G, don't support 3G. GP4-WLTE- Suitable for European countries, Eastern Europe and Russia,Countries in Southeast Asia, Central Asia and the Middle East, Africa Don't support power failure alarm. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC220V Colour:As Shown Material:Plastic Package Contents: 1 * GSM SMS APP Controller 1 * Power Adapter 1 * Antenna 1 * English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.