1. Protect the battery from overcharging, over discharging, over load and short circuiting etc. can effectively extend the battery life span. 
2. Prevent the battery reverse charging the solar panel when there is no sunlight. 
3. Microcontroller Control for Fully Intelligent System 
4. Utilizes Serial Mode PWM Control for Maximum Efficiency
5. Temperature Compensation 
6. Digital LED Indicator Light 
7. Wide Temperature Working Range of -35c to 50c
8. No Adjustable Resistance
9.Product size: 145*92*29mm 
10. Product net weight: 150g