Feature: 1. Intelligent Detection: The infrared sensor door bell utilizes infrared motion sensing technology to accurately detect individuals at the door, providing timely notifications to the store owner or residents. 2. Split Design: The door alert main unit and the alarm can be separated, allowing for flexible installation options to enhance the security effectiveness according to your needs. 3. Voice Broadcasting: The motion sensor alert utilizes household language broadcasting to provide friendly reminders of the visitor's identity or broadcast warning messages. 4. Multiple Music Selections: With a variety of built in melodies, the motion sensor door bell allows for free switching to better meet personal preferences and needs. 5. High Reliability: With precise detection and audio playback, the welcome door bell ensures timely alerts and clear voice broadcasting effects, guaranteeing effective and reliable performance. Specification: Item Type: Door Entry Alert Material: ABS Battery Type: Lithium Battery, Battery Type: 1.5VAAA x 3 (transmitter not included battery) Receiver Operating Current: ≤60mA, Quiescent Current: ≤7mA; Power: ≦2W; Music: 36 Chords Music Can Be Selected; Operating Frequency: 433MHZ; Controllable Volume: 20-80dB (4 Step Volume Adjustment Options); Remote Control, Reception Distance: Approx. 200-300m / 656-984ft (Open Area); Transmitter Working Frequency: 433MHZ; Transmitter Working Current: ≦12mA LED Indicator: The transmitter senses the person, the LED indicator of the transmitter lights up, the transmitter works, at the same time, the receiver receives the instruction, it also sends out the melodious music, reminding you that there is a VIP visit, and at the same time, the LED light on the receiver also flashes regularly along with the music; Temperature Resistance: -10℃-50℃​. Package List: 2 x Transmitter1 x Receiver2 x Connector2 x Base4 x Screws4 x Expansion Screws1 x English Manual