Free shipping to worldwide 12V solar tracker and LDR sensor with dome case Water proof circuit box East and West limit switch design , It can help the tracker back to East in the night for waitng the morning sun . It is Single Axis system . This design can be match for Motor or acutator ( Voltage : 12DCV ) See this U tube link for how the SUn tracker controller working : https://youtu.be/DM7Joflr-Ko This device can help your solar system energy increased by 70%. Easy to use, easy to install, play the best performance of your solar system. There is a price cheaper than the market. Technical characteristics: Solar tracker type Single Axis Installation angle it is based on customers’ requirements Installation height it is basedon customers’ requirements Sensor protect with : Dome plastic case Input power 12 DCV Output power 12 V Motor and actuator support 12 DCV ( 1 ~ 2 amps ) Sensor type 1 set of LDR ( to East and West ) How this kit work : When you use this product, just need to install it on the left or right side of your solar bracket and a set of LDR Sensor point to the east , when the sun moves from east to west, trackerdrive your motor or actuator device to follow the sun moves. How about the energy you can get : According to our tests, the installation of a "dual axis solar tracker", we can be increased from 55% to 75% of Solar energy (compared to the terms generally are not equipped with this device) How much you can save : in addition, under this calculation if we take a group of USD 1500 solar panels, if available, an additional 50% is equal to save USD 750. This be considered truly achieve environmental protection can save money on our product ideas. Delivery time by Hong Kong Post : Country Delivery time shipping cost post type extra North America 12 ~ 17 working days Free Air mail recorded UK / Germany 8 ~ 14 working days Free Air mail recorded Others European 10 ~ 17 working days Free Air mail recorded South America 10 ~ 17 working days Free Air mail recorded Australia NZ 7~ 10 working days Free Air mail recorded Please contact us if any question about our products . ----------------------------------------------------------------------------------------------------- Small order please buy from the below link : http://www.aliexpress.com/item/Solar-tracker-system/896446968.html