Features: It help extend battery life. Universal 24V applications. Prevents primary battery discharge. The main function of this product(start-up type) is to switch on, it can be used alone, it can be also connected to control to use, but this product does not include additional control relay, and if the controller is connected, it mainly used in the dual battery. Specifications: Product series: auto relay(Different batches, the position of the sticker label on the product may be different, it does not affect) Contact load: high power Contact switching current: 500A Contact switching voltage: 7.8VDC Contact form: transformation type Rated current: 500A Protective features: sealing type Coil power: 24V DC size: 80 x 56 x 85mm Material: Nylon+metal colour: black Package Contents: 1 x Car Start Relay Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.