|Until something better comes along, this is still my favorite ARDF receiver for 80 meters. it is built like a tank - there is a definite military heritage behind its construction. The units I've purchased came with a styrofoam packing case that included a charging cord for the internal rechargable battery (Russian-style plug - you can get adaptors at any Radio Shack,) headphones, some spare screws, a small screwdriver, two steel tape sense antennas (I guess in case you damage one,) some extra screws, and a case of grease for water-sealing the case again if you have to open it up. The sense antenna detaches for storage and reattaches to the receiver with a single screw.|
Even though it is not light weight, the case is designed to be held in a way that balances the unit in your hand. The operational controls are available at your fingertips, so everything can be done with one hand (specifically, your right hand.) My biggest gripe with the rig is that there is no frequency lock function, and the tuning knob is in a location where you can accidentally bump it. The tuning is fairly sensitive, and this can cause you to lose the signal completely.
The headphones that come with the Altai 3.5 are high impedance. They have very heavy rubber earpads that really cover the ears with a good audio seal. The headphone connectors are the same as the power connector - basically a dual banana plug. I know of at least a few Altai users who have built dual banana plug to 1/8" stereo phone jack adaptors (out of parts you can get at any Radio Shack) and used small stereo headphones of the common variety with success.
Finding an Altai 3.5 may require some dedicated searching. I found mine through a contact on one of the ARDF email reflectors. Ask around.