The Grundig Yacht Boy 100 / 120 is a portable multiband "pocket radio", with it's dimensions of 23 x 4 x 14 cm and a weight of 800 g, it will fit in Your coat pocket or find some space in Your suitcase without problems.

The Yacht Boy 100 is an early example of the small Grundig travel portables with a bandspread dial for several shortwave bands; the Yacht Boy 120 is a very similar set with a digital clock / timer added.
The set was available in black and in silver colour.

The set covers VHF / FM, long and mediumwaves and six broadcast shortwave bands from 49 - 16 meters.
In the middle of the front panel, You find the slide control for volume, a thumbwheel tone control and a sliding switch to select one of the shortwave wavebands.
The analog dials for the wavebands are located at the right half of the frontpanel, the tuning knob on the right side. Four pushbuttons are used to switch on the set and to select the waveband, a fifth smaller pushbutton switches off the radio.
A tiny window for the quartz clock is located above the speaker grill only on the Yacht Boy 120 model. You can set the clock to display the time, the minutes and seconds only, You can set the timer to wake You by radio music or a buzzer sound.
I red glowind LED next to the tuning dial will act as signel strength indicator for strong stations.

The set is powered by five AA batteries for the radio and an additional clock battery, there is a connector for a matching Grundig external power supply. The antenne is a 70 cm flexible / rotating telescopic antenna.

The set has an adequate sensitivity on shortwaves, but it's analog dial with coarse frequency markings is a serious drawback, the set receives only on six shortwave broadcast bands, the 22 meter band is omitted and out of band channels cannot be tuned.
With it's clock timer, the Grundig Yacht Boy will make a fine travel radio as long as You rely on FM and mediumwaves and just want to catch up some news from the BBC or Deutsche Welle. If You really have to rely on informations from Your home on shortwaves, You should invest some money in a set with digital frequency display - from this aspect, the Grundig Yacht Boy 100 / 120 can be considered as collector's item that sometimes can be found for a few Euros at an online auction.