Kingston Hyper X (Left side not working – repairable)

Selling a defective Kingston Hyper X headset; the left earpiece produces no sound. It is repairable, but I am unaware of the repair costs. PRICE IS NON-NEGOTIABLE. Pickup available in the Braga area, or shipping nationwide via cash on delivery. Shipping costs are to be paid and transferred in advance by the buyer (this condition is non-negotiable). I respond only via message through OLX or WhatsApp (call/message).