Memorex 98700 Quad Charging Cradle (98700) SAFELY CHARGES THROUGH CONTROLLER SLEEVES, ELIMINATING THE NEED TO REMOVE PROTECTIVE SLEEVES TO CHARGE CONTROLLER BATTERIES. NIMH RECHARGEABLE BATTERY LASTS UP TO 30 HOURS FOR CONITINUOUS PLAY TIME. CHARGE INDICATOR LIGHT. HIGH-QUALITY, FAIL-SAFE TESTING. DUAL COMPATIBILITY WORKS WITH OR WITHOUT THE WII MOTIONPLUS(TM) SENSOR.