brand new and high quality Features: Speaker for protection board has features of starting delay of about 3 seconds, prevent for DC impact on the speaker when starting up. The for protection board has simple circuit, safe and reliable. for Protection board uses three 10A high-power relays, which can be easily connected to various power amplifier boards. Dual indicator lights display, one is the power indicator, the other is the switch indicator. Specifications: Working voltage: AC 12-18V, independent power supply is required. Material: Plastic Size: app.67x50mm or 2.64x1.97in Color: As pictures shown Quantity: 1pc Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x for Protection Circuit Board (other accessories demo in the picture is not included.)