Compact 4-channel 433 MHz receiving module with decoding chip and selectable modes for reliable remote control applications. Key benefits: - Durable construction uses high-quality materials for stable long-term performance. - Built-in decoding chip supports EV1527 and PT2262 protocols, ensuring compatibility with common remote encoders. - Remote learning uses the EV1527 encoding mode and each remote has an independent address code to prevent serial code conflicts and mutual interference. - Three selectable operation modes provide flexible control behavior for different applications. - Key selection mode eliminates the need for manual soldering or jumper configuration, which saves setup time and reduces installation errors. - Low standby current and moderate output drive make the module suitable for battery-powered or low-power systems. Main features and functions: - The receiving module includes a decoding chip that supports EV1527, PT2262 and similar encodings. - The remote learning function uses EV1527 encoding and assigns independent address codes to each remote to prevent interference. - The module provides three working modes: momentary, self-lock, and latching. - Mode selection is done by key selection on the module, so no soldering or jumper configuration is required. - Output is a 4-channel CMOS high-level signal corresponding to the ABCD keys of a 4-button remote; when a remote button is pressed the D0, D1, D2, or D3 output goes high and remains low when not pressed. - The module is constructed from durable materials for reliable operation. Technical specifications: - Operating frequency: 433 MHz. - Operating voltage: DC 3.3 V to 5 V. - Static current: less than or equal to 5 mA. - Output current: 10 mA. - Receiver sensitivity: -108 dB. - Reception distance: 25 to 50 meters depending on antenna and environment. - Frequency tolerance: plus or minus 0.2 MHz. - Operating temperature: -25 to 75 C. - Working modes: momentary, self-lock, latching. - Output format: 4-channel CMOS high-level signals matching ABCD remote keys. Typical applications: - Remote control for gate and garage door openers where independent remotes must not interfere with each other. - Remote switching for lighting and small appliances in workshops, warehouses, or outdoor installations. - Wireless control for alarm systems, access control, and DIY automation projects that require simple mode selection without hardware modification. Package contents: - Receiving module x 1.