Features: Used for charging 1.2V AA/AAA Ni-MH Ni-CD rechargeable batteries 4 independent channel for arbitrary charging LCD display helps you easily keep track of battery charge Press the left button for 3s to switch "CHARGE", "DISCHARGE", "REFRESH" state Press the right button for 3s to switch charging and discharging current: 300mA or 500mA With over-charge protection, short-circuit protection, over-voltage protection, over-temp protection and over-current protection Designed with USB interface, micro USB interface and type-C interface, support mulitple charging methods Specification: Item Type: Smart Battery Charger Material: Plastic + Electronic Components Color: Black Product Size: 13.5x7.3x2.5cm Input: DC 5V 2A Output: DC 1.2V AA/AAA 500/300mAh For 1.2V AA/AAA NI-MH NI-CD Battery Note: Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting. Thank you for your understanding, nice day! Package Includes: 1 x USB Battery Charger 1 x User Manual