ER-55SD
- ER-55 Series is with built-in siren and DC. jack function
- SD: SIREN+DC.JACK
| Model | ER-55SD |
| Power | MAX 25W |
| Range | 0.5~0.7KM depending on operating conditions |
| Battery | 8 x "C" type batteries (not supplied) |
| External Power | 12V battery or 8-1.5V DC |
| Speaker Impedance | 8Ω |
| Dimension (dia.) | Φ230 x 370 mm (Φ9.1" x 14.6") |
| Weight | 1.65 kg (3.64 Ibs) (without battery) |