etón FR250
Rear Panel

 

 

The etón FR250 rear panel features the battery compartment plus the 3.5mm mono earphone jack and a DC [—] input jack for external power (4.5 VDC; negative polarity; 100 milliampere; plug tip outer diameter 3.4mm, inner diameter 1.3mm) and a mini coaxial jack for power out to a cellular phone.