Likely between low to mid-$xxx, depending on the buyer. The 'tele' bit ruins it - StereoPhone.com would easily get $xxxx. Having said, I do suggest you not to go ahead and sell it to the first reseller who makes you an offer - instead, list it on Sedo and a few other non-domainer marketplaces and wait until an interested end-user comes along. This way you'll get A LOT more out of the domain.