Boss WL-50.  Performed for every gig and rehearsal without a glitch for 5 or more years until I switched to the Legato bugs.  No box but here's the Boss page:  https://www.boss.info/global/products/wl-50/   These are just shy of £200 new, I'm asking £100 posted to UK mainland.  Alternatively try before you buy in Benfleet, Essex.