Features:5V constant voltage output, automatically identify mobile phones and other smart phones. Automatic restart (stop charging when the sunlight is weak, and automatically resume after discharging to strong sunlight). Wide range of applications, compatible with most smartphones, tablets, ipads, digital cameras, etc. Dual USB regulators, voltage regulators developed for solar panel voltage instability, can stabilize voltage output. High-quality plastic shell, beautiful appearance, light and portable, industrial temperature range -40~85℃, high conversion efficiency. Instructions: 1. First, weld the positive and negative poles of the product to the positive and negative poles of the product with wires. 2. When there is a voltage input, the USB have a voltage output. Note: Do not reverse the positive and negative electrodes during use, as this burn out the circuit. 3. The output have a red indicator light. Specification: Size: 1.81 x 2.6 x 0.63in/4.6 x 6.6 x 1.6cm Input voltage: 5-20V Output voltage: 5V USB Output current: 3000MA (MAX) USB2.0 output: 5V 3000MA (MAX) Uses: 5V working use of USB charging electronic products such as mobile phones Material: plastic colour: Black Package Contents: 1 x Dual USB Charger Regulator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.