With 4 independent charging slots, smart charger supports different types of DC 3.7V cylindrical lithium batteries simultaneously SAFETY GUARANTEE - Battery charger is equipped with advanced charge management circuit. In addition, it is designed with safety protection settings, the charger can effectively prevent reverse damage, short circuit, overcharge, overdischarge and overcurrent. Simply use it without worrying about safety. HIGH QUALITY MATERIAL - The rechargeable battery charger is made of flame retardant material. Excellent heat dissipation and electronic circuit design, which can extend the life of your battery. Color: Black Material: ABS Size: About 137 x 37 x 97 mm Package Contents: 1 x Battery Charger 1 x USB Charging Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.