The Super BirdXPeller Pro is a 4-Speaker Digital Bird Scarer that uses the pest birds' own distress calls to create a sense of danger and scares them away, effectively, naturally and harmlessly.The Super BirdXpeller Pro is ideal for use in small and medium commercial applications up to 3600m2. The system features a central control unit, which can be mounted within easy reach and four weatherproof speakers each pre-wired with 30m of speaker flex and an audio jack. The system is designed to be simple to install, just plug and play. The user can program the system to select the type of distress call(s) required, the volume and the time interval between calls. Super BirdXpeller Pro can either be mains powered or powered by a 12-Volt DC deep-cycle battery (not supplied). The control unit has a daylight sensor built-in which can be used for day only, night only or 24 hour operation. Each call plays for about 60 seconds, if more than one call is programmed-in they will play in quick succession. They will play in random order, or in sequence, depending upon how you programme the BirdxPeller Pro. The intervals between each series of calls can be varied between 17 seconds to 30 minutes. These scarers can be used on their own but for improved detterrence it is advisable that they are used in conjunction with other, visual, scaring devices.This product includes:One Super Bird Xpeller Pro weatherproof central control unit 220mm x 200mm x 137mm (can be mounted remotely from the speakers) complete with either a 220 volt AC mains adaptor or a 12 volt DC battery adaptor (battery not supplied).Four-weatherproof speakers each 96mm X 144mm X 83mm, each with 30 meters of speaker cable for remote mounting . Supplied with a six month manufacturers' guarantee.This version of Super BirdXPeller Pro (Version 1) repels: Pigeons, Starlings, Sparrows, & Gulls.Where can the Super BirdXPeller Pro be used?Open areas (fields, farm yards and gardens)Marinas, harbours and docks.Industrial/Commercial building roof tops.Warehouses and loading bays. The system can be mounted either indoors or outdoors and is supplied in its own weatherproof casing. Use with standard 240 Volt AC electricity (mains adapter included) or purchase a 12 Volt DC deep cycle marine-type battery instead for remote / wireless use (select the 12 volt option when purchasing).TechnicalCoverage: up to 6 acres (2.4 hectares) at full volume.Sound Pressure: 105 - 110 dB at 1 meter.Frequency: 3 - 5 kHzPlease note, this system will not deter pest birds if they are being fed or there is an artificial food source on site, or they are already nesting, or have nested on the site in the past. All nests must be cleared first, in accordance with applicable local legislation and the old nest site cleaned thoroughly with avian disinfectant such as PX Ornikill or Guanaway to remove the birds' scent. All artificial food sources must be stopped in advance of installation.