The VARTA USB Quattro Charger is a compact charger for up to four AA or AAA NiMH rechargeable batteries. The USB-C input with 5 V / 1 A allows the device to be used flexibly with different power sources. The LED indicators provide information about the current charge status. Thanks to integrated safety technology with minus-delta-V cut-off, safety timer and short-circuit and polarity protection, rechargeable batteries are charged reliably and gently.