Use USB power supply mode. There are 1, 2 lamp holders, and the lamp holder can be switched on mode, as well as timing function. There are 54 red beads and 24 beads on every head, you can use the controller to decide whether to turn on red light, blue light or purple light. It can rotate 360 degrees to meet your need for plant growth light. Efficient waterproof, you can water it directly. Multi-stage dimming, effectively control of illumination brightness. The use of plant growth lamps can effectively improve the growth of plants and increase the yield of crops. Especially suitable for potted enthusiasts. Material: PC + Aluminum Packaging size: 18*13*9.9 cm Weight: About 286.8g/428.6g Power: 15W/30W Input Voltage: USB-5V Number of LED beads per head: 54 red + 24 blue Luminous flux: 1250 (lm) Color rendering index: 80 Role: Promoting plant photosynthesis Package Includes: 1x LED Grow Light