Takenaka Engineering TAKEX Wireless Radio Passive Sensor Transmitter # Serial numbers are listed on each sensor. Model Number: TXF-105WL Battery Housing Unit [Base] [Three-dimensional surveillance type] Model Number: TXF-105 Sensor Unit ※⚠️#Caution: This is a wireless passive sensor that can only be used with TAKEX wireless transmitters and receivers. ◉ The jack was not removed, so the spring came off when I tried to remove it. The batteries were also depleted, so I removed all four. I think they can still be used, but I will check using the DC11V method. All items have been tested and confirmed to be working. ▶︎⤵︎ ※#There are also separately sold Atsumi wireless transmitters "WST100 transmitter" and passive sensors. There are also contact wireless unit battery types. Detection: Passive Infrared Surveillance Area: Three-dimensional surveillance Maximum range: Approximately 12m Weight: Approximately 130g Appearance: Main body cover - resin TAKEX Home PDF Wireless Passive Sensor https://www.takex-eng.co.jp/ja/products/category/22/