Recommended to find a power bank that supplies at least 2 amps at 5 volts

Also good for thick costumes

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-Forearm Circumference

Or just impress your friends

Biomechanical Cyborg Gauntlets Size:M Recommended to find a powerSerrated metal armor, multiple organic styled layers interwoven with blue flat panel lights. Durable brushed aluminum construction. Inner surface is covered with soft black fabric. A wide velcro wrist strap meshes with velcro patches on the inside of the gauntlet. Holding the gauntlet tight against your arm as you move (not shown). Adjustable lower panel can expand or retract slightly to adjust for minor differences in forearm size and to rotate open