| Manufacturer | South Tun City Astronomical Safety Equipment Ltd. |
| Category | Alarm. |
| Price | ￥420.0 |
| Origin | South Tun City Astronomical Safety Equipment Ltd. |
| Imported or not | Yes |
| Work current. | Less than 2.5 mA |
| Work voltage | 1.5V Silver oxide button batteries |
| Scope of application | 220V-500KV |
| Model | 1SW77 |
| Volume | > 65dB(A) |
| Brand | DingDing |
| Whether or not to export a source of goods exclusively across borders | Yes |
| Type | Quick call. |
| Purpose | Near-line alert -- tactile forecasting police function |
