Features include a lithium-ion battery with an input voltage of 3.7V and an output of 5V, capable of charging smartphones. The socks come in a sleek black color.
For optimal care, place the socks in a mesh laundry bag before washing. Detach the battery from the vest and seal the USB connector cap. Machine wash on a cold, gentle cycle with mild detergent, avoiding fabric softeners. Tumble dry on low and remove immediately. Do not wring, twist, iron, or dry clean to preserve fabric integrity.