PowerBank Charger U421 & 4 ReCyko Pro AA The U421 Charger provides a universal USB charging platform for NiMH. U421 can charge 1 AA or AAA NiMH battery in 40 minutes or 4 of the same battery in less than 3 hours. With a convenient, compact design it’s ideal for high-performance charging in travel, household and business use. Features: Charge up to 4 AA or AAA NiMH batteries 40 minutes high speed charging LED indicator displays battery condition & charging status Malfunctioning or single use battery detection Reverse polarity protection Over-temperature protection Supplied with: 4 x AA ReCyKo Pro NiMH U421 USB Rapid Charger 3 year warranty