Here are the differences between the Amphony model 2500 and model 500:
2500:
- 200FT LOS (Line of Sight) and 50FT NLOS (Non-Line of Sight) operating range
- Headphones are made of a soft felt material
- Volume knob on the transmitter
- Battery charger on the transmitter
- RCA Data out port with RCA audio out.
- Digital Optical in port
- Digital Coaxial in port

500:
- 100ft max operating range
- Headphones made of shinny vinyl type of material

Those are the only differences between the two devices. To me it's deffinately worth the extra money to have a comfy headset and the ability to charge your batteries right on the unit.
2500:
- 200FT LOS (Line of Sight) and 50FT NLOS (Non-Line of Sight) operating range
- Headphones are made of a soft felt material
- Volume knob on the transmitter
- Battery charger on the transmitter
- RCA Data out port with RCA audio out.
- Digital Optical in port
- Digital Coaxial in port
500:
- 100ft max operating range
- Headphones made of shinny vinyl type of material
Those are the only differences between the two devices. To me it's deffinately worth the extra money to have a comfy headset and the ability to charge your batteries right on the unit.