This does not affect your right to an exchange or refund for faulty equipment.
The Grivel Master Pro is a single device that can be used for lead-belaying, top-belay seconders and rapelling. The air holes in the sides of the device allow for more ventilation to dissipate heat on longer descents. Guide mode when top-belaying creates an auto-blocking mechanism for security and ease of belaying. The deep V grooves provide friction for a secure catch.