HORIZON STAR ENERGY LTD. (HK) WE ARE A EXPORTER OF SOLAR PANELS + SOLAR RELATED ACCESSORIES. 5A SOLAR CHARGE CONTROLLER- $20. 00 USD 10A SOLAR CHARGE CONTROLLER- $22. 50 USD 20A INTELLIGENT SOLAR CHARGE CONTROLLER- $80. 00 USD NO MINIMUM QTY REQUIRED SINGLE ORDERS ACCEPTED WE ACCEPT PAYPAL DISCOUNT OFFERED TO HIGHER QUANTITY PRODUCT FEATURES 1. Overloading protection 2. Short circuit protection 3. Reverse current protection 4. Reverse polarity connection protection 5. Thunder protection 6. Over discharge protection 7. Overcharge protection 8. The temperature compensation 9. Analogous circuit control PLEASE EMAIL US IF YOU HAVE ANY QUESTIONS.