A device for testing the operability of an AC power outlet, a DC power outlet and AV input jacks may include an AC test circuit, a DC test circuit, an AV test circuit, a logic circuit, and a system OK indicator. Each of the pleat halves of each of the pleats cooperates with an adjacent one of the pleat halves of an adjacent one of the pleats to define a second elbow therebetween. The use of a flexible wall to convey an effort to a load avoids the need for sliding parts and can provide advantages such as reduced friction and ease of sealing.