1. Control by a 8-bit microchip; automatically check cell number 1; 2 or 3 2. Selectable charge rate 250mA?500mA? 1000mA?1.5A?2.0Amp 3. Built-in set-up circuit. It is easily used at 11.1V(3 cell) that large capacity charge current (2A) 4. Input has short circuit protection circuitry & Output utilizes the PTC fuse as protection 5. With LED light and beeper to indicate the charging status 6. Switching transfer that can reduce the heat attrition substantially