Wireless and waterproof push button, intercom chime with a 180m calling range and 64 selectable receiving volume levels. - Brand: REVEX - Model: XP710A - Features: Wireless, waterproof push button - Calling Range: 180m - Receiving Volume: 64 levels - Usage: Intercom, calling chime Specifications ■ Radio wave range: Outdoor line of sight/up to 180m, Indoor line of sight/up to 90m ■ Transmission/reception frequency: 315MHz band "Transmitter" ■ Power supply: Coin-type lithium battery CR2032 x 2 (sold separately) ■ Battery life: Approximately 1.5 years (10 transmissions per day) ■ Installation location: Indoor/Outdoor (IP67) ■ Body dimensions (approx.): W60 x H70 x D27mm ■ Weight (approx.): 38g "Receiver" ■ Power supply: AA alkaline batteries x 3 (sold separately), AC adapter (sold separately) not compatible ■ Battery life: Approximately 6 months (10 receptions per day) ■ Individual reception display: × ■ Operation modes: Sound and light / Sound / Light ■ Volume: 45～90dB/1m ■ Installation location: Indoor ■ Body dimensions: Approx. W90 x H91 x D32mm ■ Weight: Approx. 85g When the push button is pressed, it notifies you with light, chimes, or voice from a remote location. The push button transmitter is waterproof, so it can be used outdoors or in bathrooms, where it may get wet. It has been used very little and is in near-new condition. The double-sided tape is included as an accessory but has not been used. The radio waves were able to reach and function even in a detached house connected by a covered walkway. No pets or smoking, but please refrain from purchasing if you are sensitive to such factors.