ZESS Pad 80 (ZP-80-05) - Impact sensor is built in, and it is activated only when Zess Bluetooth transmitter is connected. - When attaching Zess Bluetooth transmitter, make sure that the Velcro is fully tightened so that it does not fall off during the games. - can be used by attaching to sandbags, free standing bags, zemita air standing bags, zemita bridge bags and so on. - Select the length of the gusset pad to fit the perimeter of the product to be installed (sandbag, stand bag, etc.). Zess Pad 80 (ZP-80-05): Suitable for standing bag with a circumference of about 84cm and a diameter of 23 ~ 26cm Zess Pad 100 (ZP-100-05): Suitable for standing bag with a circumference of about 104cm and a diameter of 27 ~ 32cm (recommendation of Zemita Air Standing Bag L) Zess Pad 120 (ZP-120-05): Suitable for standing bag with a circumference of about 124 cm and a diameter of 33 to 38 cm - The transmitter is not included and sold separately. - The output of hitting power from the pad can be different due to the position of pad on the punching bag, direction and area of the striking, the elasticity difference between the standing bags, and the air pressure difference between the air standing bags