Charges 1-4 pieces of AAA & AA batteries Independent charge channel for each battery Negative delta V detection switches off charger immediately the batteries are fully charged Timer control Trickle charge function keeps batteries topped up when fully charged Overcharge over discharge short circuit & reverse polarity protection Faulty battery detection Low battery leakage current Pule charging function LEDs indicate charging status of each individual battery Worldwide voltage range 100V-240V subject to use with a suitable travel adaptor 3-9 hours average charge time