extension box

Many models convert one wall outlet into multiple outlets; common counts shown include 3, 4, and 6 outlets, and some cable-management boxes convert one socket into five grounded outlets.

Many units include integrated circuit breakers and automatic shutdown technology, safety outlet covers or twist-to-close outlets, protected indicator lights, and in some cases connected-equipment protection policies; several listings also show UL or ETL safety listings.

Some surge-protector extension boxes pair grounded AC outlets with USB charging ports; the listings include units with two standard USB-A ports (combined 2.4A) alongside multiple AC outlets.

Designs for tight spaces include flat plugs and low-profile cords that sit close to the wall, compact or cube-shaped housings that leave room for bulky adapters, and braided or tangle-resistant cords for neater routing.

Several units list common safety certifications such as UL Listed and ETL Listed on their product details.

Common features include integrated keyhole slots for wall or desk mounting, flat plugs to keep the unit close to the wall, braided cords that resist tangling, and cable-management boxes that hide cords while converting a socket into multiple grounded outlets.