An earplug for a hearing aid, in particular for a BTE-type hearing aid, has a front end and a rear end. On an operation unit 14, either a normal counting mode or a continuous counting mode is selected. The first server includes a downstream proxy configured to modify the request to include information specifying support of a parse and pre-fetch service within an optional header field of the request as to permit handling of the modified request by the web server in absence of an upstream proxy that is communicating with the web server. The canopy assembly may be folded where the protective canopy is moved out of the way allowing golf clubs to be removed from the golf bags without hitting the canopy assembly. The purchasing system includes a video stream display configured to display a video stream including video content and a purchasing interface configured to display an item available for purchase based on the video content.