| Model | Description | Manufacturer |
|---|---|---|
| Security Receiver | RHK Technology | |
| Security Receiver | RHK Technology | |
| Sonic Alert Transmitter | RHK Technology | |
| Wireless Basic Receiver Unit | RHK Technology | |
| Wireless Doorbell Signaling Device | RHK Technology | |
| Home Aware Main Unit signaling system for the Deaf | RHK Technology | |
| Wireless Sound Signaling Device | RHK Technology |
