12v timer relay module: the delay timer eliminates the impact sound when the car audio is turned on, protecting the audio equipment and circuit. Speaker timer relay: the delay timer can delay the start-up time of the audio equipment, avoiding sudden sound interference. Electric delay timer switch: the digital delay relay is finely crafted, providing precise timing control for car audio systems. Automotive digital delay relay: the time delay relay is made of sturdy abs material, which can be used for a long time. Color: Black 12v timer relay module: the delay timer eliminates the impact sound when the car audio is turned on, protecting the audio equipment and circuit. Speaker timer relay: the delay timer can delay the start-up time of the audio equipment, avoiding sudden sound interference. COOLHIYA Audio Delay Speaker Controller Module Time Delay Relay Timer Relay Module 12v Timer Relay Electric Delay Timer Switch Relay Timer for Car Speaker Car Relay Timer Switch