– It is a Special Double Paddle, made by form-forming, with a sensor attached. – The Double Paddle generates a much bigger sound when punched, compared to the Single Paddle. – It can be used with the Zess Bluetooth Transmitter attached. During the attachment, firmly attach the Velcro and fix it so that it will not fall off. – Paddle-type products have a sensitively set sensor and therefore can respond to even weak hits, which means they are not proper for use for power measurement.