... message (10 second), it can be recovered.When received alarm message, it speaks as you spoken. 6. NI-MH ... be delayed17.All panels can connect with the alarm receipt managing centreSpecification:1. Wireless frequency: two option: 433MHz or 315MHz2. ... 10m*120° horizontal+60°vertical10.Optional sensor: wire siren, wireless smoke detector, gas leakage detector, vibration sensor, siren with strobe light ...