Product features 7.4 * 5.0 to 4.5 * 3.0 adapter. Applicable to HP power to HP computer and Dell power to Dell computer. The two cannot be cross transferred. The two power supplies are not common. Dell's computer can only be powered on, not charged! Specifications: Input end (female head): outer diameter 7.4mm, inner diameter 5.0mm, with needle Output end (male): outer diameter 4.5mm, inner diameter 3.0mm, with needle
