Rubber cover should be on to protect the device from moisture. USB Charger Input: 12-24 V, Output: type C output= 55w watts, QC 3.0 output = 18 faster than normal. USB Charger has blue LED Voltmeter indicator built in, Voltage:12V-24V Maximum peak load:12V 20A DC; 24V 10A DC Bulb Type:LED/blue Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Package Included: 1 x 5 Gang Switch Panel/ blister box packing 5 x Rocker Switches 1 x Fast USB Charger 4 x Screws 2x Labels Sticker, 1x Metal box. Box dimensions are 2.72” x 2.68” x 8.03” (refer to picture above for detail dimensions.)