General description Smart USB Li-Ion 18650 26650 Battery Charger is a portable power charging solution designed for various types of DC 3.7V cylindrical lithium batteries. With 4 independent charging slots, this smart charger allows for simultaneous charging of different battery types while ensuring safety and efficiency. Technical specifications Input Voltage: 5V Output Voltage: 4.2V Size: About 137 x 37 x 97 mm Material: ABS (flame retardant) Package Contents: 1 x Battery Charger, 1 x USB Charging Cable Measurement allowed error: +/- 1-3 cm Other information The charger is equipped with an advanced charge management circuit and features safety protection settings to prevent reverse damage, short circuit, overcharge, overdischarge, and overcurrent. Excellent heat dissipation and electronic circuit design extend the life of your battery. Note: Light reflection and different displays may cause the color of the item to differ slightly from the real thing.