Internal analog radio siren with optical indicator. Equipped with radio transmitter / receiver. Equipped with a double source of lithium batteries that guarantee the operation of the siren for 5 years, being it fully supervised. It has acoustic output of up to 97dB and 32 selectable tones. Selectable flash rate (1Hz or 0.5Hz), with LED technology. Coverage code EN54-23 W-3,1-11,5. It has a tamper fault signal, to prevent the equipment from unwanted extractions or physical damage. Designed and manufactured according to EN54-3, EN54-23, EN54-25 and EN300-220 standards. Degree of protection IP54. 868MHz working frequency. Red siren with white optical indicator.