Battery Charger with sound Charge AA, AAA NI-MH/NI-Cd 2 hours Delta V cutoff function, microprocessor controlled Can be used with AC 100-240V or DC 12V (Car use) with AC power cord and DC car charge cord 4 independent channels for quick charge/trickle charge/bad cell detection Equipped with a dual LED Lamp to indicate proper charging Temperature sensor to avoid the battery from being damage by over-heating *Safty timer controllered * Charger will sound after finished. Size of housing: 114x66x29mm