XTAR L4 FOUR CHANNEL (1-4 CELLS) FULLY AUTOMATIC LIION & NIMH BATTERY CHARGER. FEATURES: FOUR CELL CHARGER FOR CHARGING: -1.5V LITHIUM ION CELL IN SIZES AAA, AA (THE L4 CHARGER CANNOT CHARGE 3.2/3.6/3.7V LITHIUM BATTERIES. IF SUCH BATTERIES ARE MISTAKENLY INSERTED, THE L4 CHARGER WILL QUICKLY FLASH A RED LIGHT AND WILL NOT CHARGE THEM.) -1.2V NIMH CELLS IN SIZES AAA, AA POWERED VIA USB-A TO USB-C INPUT (CABLE INCLUDED). CONSTANT CHARGING CURRENT 0.5A*4. SMART FAST CHARGING TC-CC-CV FOR 1.5V LITHIUM BATTERIES WITH AUTO-STOP. UNIQUE CVSA TECH FOR 1.2V NIMH BATTERIES FOR FASTER CHARGING, HIGHER ACCURACY OF FULL-CHARGE DETECTION AND LOWER BATTERY TEMPERATURES; FULLY CHARGE IN 6HRS. LED CHARGING STATUS INDICATORS PER CHANNEL. INDICATORS ALSO FLASH RED (ERROR) IF NON-RECHARGEABLE BATTERIES ARE DETECTED OR BATTERY IS INSERTED INCORRECTLY. 0V DISCHARGED CELL WAKE-UP FUNCTION. HOLLOW OUT DESIGN ALLOWS AIRFLOW FOR GOOD HEAT DISSIPATION, AND ALSO MAKES IT EASY TO REMOVE BATTERIES. MULTI LEVEL PROTECTION -INTELLIGENT REVERSE POLARITY PROTECTION -OVER CHARGE PROTECTION -OVER CURRENT PROTECTION -OVER VOLTAGE PTOTECTION -DRY BATTERY DETECTION -SHORT CIRCUIT PROTECTION