And "hear" it is...! Hooked up Logitechs to my Big Bud Pro Select 220D and tossed a penny (a real copper penny) on the lawn and started to make passes over it.........
And friend Gopher is right, there is a delay. Maybe a 1/10 second delay. It might bother some folks! But when I detect I'm usually scanning fairly fast in moving discriminate, so I really don't care if the alert is not directly under the loop (although your brain can interpolate and you could correctly know "close enough" where the target is), however, normally when I hit a target I immediately switch to "all metals" and zero the target.
So, I consider these babies a winner, and a welcome addition to my metal detecting tools array. So much so that I'm going to change out the 1/4 in headphone jack to an 1/8 jack to eliminate the adaptor, which will move the Logitech transmitter a little closer to the detector body. You know one of those "if your smart, you'll watch your back" thingies. No more caught headphones, entangled in brush, while I'm negotiating a steep, twisted trail. I definitely recommend these, although if you go out on long, all day, metal detecting, trips I'd seriously include a small Dc to Ac inverter. The Logitechs are only rated for about 6 hrs usage (ah-hah back to the short usable times for rechargeable batteries) . So you could plug one into your cig lighter (finally a use?) and recharge while your eating your Baloney sandwich, and chug-a-lugging a couple of Jolts! See you out at the cemetery
Addendem: If you buy some.....be aware you have to hold down tiny button switch for several seconds on both pieces before you get a red light. Both red lights will turn blue when they connect.