Built-in rechargeable battery--Built-in 2200mAh lithium battery, you no longer need to place or replace the battery or find a place to insert it. It is a fully autonomous system that allows you to move freely around your yard or home. Once charged (using the simple USB to Mini USB cable we provide), it can run for up to 2 months. After that, you only have to charge it again for 5 hours and you're ready for the next few months. Easy to Setup This watering system is easy to set up. First set the watering time to 1~90 seconds or 2~3 minutes; then set the watering interval to 12 hours or 1~10 days. Solve the problems of taking care of plants during your daily work and travel. Automatic watering devices can help you water on time every day, making your plants grow healthier and longer, making your life easier. Efficient water-saving design The automatic plant watering system combines watering time and a water pump to deliver the right amount of water from a bucket or tank to up to 4/8/12 potted plants. Compared with traditional spray and plant irrigation drippers, it saves 70% water and works more efficiently, saving your time and water.