Two-way indoor wireless sounder that uses the latest LoNa technology and 433Mhz frequency completes the alarm system. This siren can be easily installed thanks to its wireless communication, power and learning mode technology. It also meets the safety requirements of EN50130. This siren is shipped with a 9v lithium battery and 4xAA alkaline batteries. Battery life: 3 years, Power: 101 dB. Range: up to 400 m. Dimensions: 155x114x44m.