HIKVISION Siren DS-PS1-E-WE AX PRO (Blue)

Operating Range: 1600 meters (in open space)
Protection Class: IP65
Frequency Hopping for Interference Protection
Sound Level: 90 – 110 dB
Battery Type: 4 * CR123A batteries (included, easily replaceable)
Battery Life: up to 3 years
868 MHz two-way wireless communication