Features 1Practical Use: Enables light control and delay control adjustable charging and discharging parameters power off memory etc. 2Large Current: Dual USB output enables a maximum current up to 2.5A supporting quick charging for phone and other electronics. 3Clear Display: Large LCD screen can clearly display accumulative power generation discharge power query temperature and so on. 4Safer Working: With built in over current short circuit protection open circuit protection and reverse connection protection. 5Smart Design: Adopting industrial grade main control chip and anti backflow circuit which ensures ultra low heat generation. Specification Item Type: Solar Charge ControllerMaterial: ABSModel: K1688Colour: BlueUSB Output: 2 USB outputs 5V 2.5A (maximum). Standby Current: <10mAWorking Temperature: -35~+60 Maximum PV Input Power 10A 20A 30A Rated Voltage(12V or 24V) 130W(12V) 260W(24V) 260W(12V) 520W(24V) 390W(12V) 780W(24V) Package List 1 x Solar Charge Controller1 x User Manual Note Recommendations for Safe Use: 1. This controller automatically recognizes 12V or 24V. When installing for the first time please make sure that the battery has enough voltage so that the controller can recognize the correct battery type. 2. Install the controller as close to the battery as possible to avoid voltage drop caused by excessively long wires and affect normal voltage judgement. 3. This controller is only suitable for various LA batteries (including openings seals gels etc.). 4. This controller can only use photovoltaic panels as the charging source. Do not use DC or other power sources as the charging source. 5. The controller will heat up when it is running please pay attention to install the controller on a flat well ventilated surface.