This product is a PWM-controlled relay switch. Unlike field-effect transistors, it establishes a direct physical connection, enabling compatibility with higher DC voltages and AC circuits. Control terminal: Input voltage 5 V (connects to receiver). PWM control: When the pulse width is high (greater than 1750 µs), the NO (Normally Open) and COM (Common) terminals are connected, while the NC (Normally Closed) and COM terminals are disconnected. NC and COM remain connected at all times except when the pulse width exceeds 1750 µs. This device accepts standard servo PWM signals. A solder jumper is provided to enable a 3-second delay before automatic disconnection. Maximum ratings: 30 V DC at 2 A; 125 V AC at 0.5 A. Motherboard dimensions: 29 × 9 × 8 mm. Relay module dimensions: 10 × 6.5 × 5.4 mm. Relay coil power consumption: approximately 140 mW. Color: As shown in product images. Material: Composite material. Package includes: 1 × PWM Relay Switch. Other items shown are not included. Note: Color appearance may vary slightly due to lighting conditions and screen settings. Dimensional tolerance: ±1–3 mm.