The RS-191 Handset is designed exclusively for use indoors in combination with the RS-190 Substation. Lifting the handset permits handset conversation. Handset conversation can be established in conjunction with the optional Flush-mount Hands-free Master Station N-8031MS.
| Dynamic type | 
| Electret condenser type | 
| 0℃ to +40℃ (Temperature range not to freeze the speaker and switch) | 
| ABS resin, pale white | 
| 116 (W) × 220 (H) × 70 (D) mm | 
| 330 g | 
| Box mounting screw (No.6-32UNC × 8) ……4, Box mounting screw (M4 × 25) ……4 |