Thanks to mounting system SkyDrop variometer can be easily mounted to the riser. System contains plastic holder, Velcro and two straps. It is designed for safety and maximal comfort during flight. One piece is included accessorize with SkyDrop vario.Instructions for use: Place one of the velcro pieces on the back side of SkyDrop. Another velcro piece place on the plastic holder. Take two straps and grip the plastic holder to your riser (straps will fit into narrow part at both ends). When you grip the holder with two straps, then cut off what was left from straps. At the end just add SkyDrop to holder.