Roberts Radio RP28 - Manual (Page 5)

Headphones
A 3.5mm socket (4) is provided for use with either headphones or an
earpiece. Inserting a plug into this socket automatically mutes the internal
loudspeaker.
Specifications
Power Requirements 9.0V
Batteries 6 x IEC R14 (C size)
Battery Life
Approx. 60hrs of listening for 4 hours a day at
normal volume using alkaline cells.
Frequency Coverage
FM 87.5-108MHz
MW 522- 1620kHz
LW 150- 281kHz
Circuit Features
4 ICs, 4 Transistors, 17 diodes.
Loudspeaker 100mm 8ohms
Output Power 1watt into 8ohms
Headphone socket 3.5mm dia
Aerial System FM Telescopic aerial
MW Built-in Ferrite aerial
LW Built-in Ferrite aerial
The Company reserves the right to amend the specification without notice.