When evaluating mini electric screwdrivers, prioritize torque control and rotation speed. For electronics repair (phones, watches, laptops), a dual torque mode (e.g., 0.15/3.0 N.m) is essential to prevent stripping delicate screws. Ensure the device features a high-speed motor (at least 200 RPM) and a rechargeable lithium-ion battery with a capacity of 350mAh or higher to guarantee long standby times. Additionally, look for S2 steel bits with a hardness rating of 60HRC, as these offer superior durability compared to standard CR-V steel.