Bizarre name, bizarre product.
These are earphones, but also include a speaker. To use the speaker, you stick the headphones into the speaker itself.

Elecom Corporation will release the "Ear Horn (EHP-700series)" that can be used as both inner-earphones and speaker in the back part of July. The price is 2,970 yen. Although the basic body color o­n all of the units is white, color variations will be available: black, blue, orange, light blue, pink, red, white, and yellow-green.

This "horn speaker" can be used as both inner-ear type headphones and speakers when the earphones are plugged into them. The earphones themselves are open-air type, with a 13.5mm diameter driver. Frequency response is from 20Hz ~ 20kHz, and the impedence is 16 ohms. The output pressure level is 102dB/1mW. The cable length is 50cm.

The "horn speaker" process consists of setting the earphones inside the speaker, and the small internal volume of the earphones is outputted after amplification through a resonance body in the eddy. "Horn Speaker" is currently being appplied for copyrights. The external dimensions of the horn speaker is 27 x 81 x 81mm (W x D x H), and it has a weight of 52g. A 1m extension cable is included.





Inspired by:
http://www.watch.impress.co.jp/av/docs/20040713/elecom.htm

Press Release:
http://www.elecom.co.jp/news/200407/ear-horn/index.html