Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Function: this switch module can effectively your battery when failure automatically. Automatic design: you will no need to care it after installation. Premium material: anti-rust,wear-resistant,sturdy and solid, and can long-term service. Light in weight: Easy to carry and store,convenient for daily and replacement. Easy to install: simple and practical to install, one-handed operation. Product name: failure automatic switching module Item 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 the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.