Function: this switch module can effectively protect your battery when power failure automatically. Automatic design: you will no longer need to care it after installation. Premium material: anti-rust,wear-,sturdy and solid, and can provide long-term service. Light in weight: Easy to carry and store,convenient for daily use and replacement. Easy to install: simple and practical to install, one-handed operation. Product name: Power failure automatic switching module Item model number: X804 Applicable voltage: DC 12V-48V Product load: 10A Product size: 50 x 30 x 18mm Material: PC color: blue Package Contents: 1 x Module 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.