Image: Detailed view of the TX118SA transmitter module, showing power input and button connections. The TX118SA is a 433MHz RF transmitter module designed for remote control applications. It features a wide voltage input range. Pinout Description:LED: Indicator Light DC 3V-24V: Power Supply Input K1, K2, K3, K4: Button Inputs (Connect to ground to transmit) ANT: Antenna Connection Point Document Outline QIACHIP RX480E+TX118SA 3SETS QIACHIP 433MHz RF Transmitter and Receiver Module Instruction Manual 1. Product Overview 2. Component Identification and Specifications 2.1. RX480E Receiver Module 2.2. TX118SA Transmitter Module 3. Setup and Wiring 3.1. Basic Connection Diagram 3.2. Power Supply and Antenna 4. Operating Modes and Pairing 4.1. Learning Button Usage 4.2. Mode Descriptions 4.3. Pairing Process 5. Troubleshooting 6. Specifications 7. Maintenance and Care 8. Warranty and Support