Feature Dual monitoring detection, infrared and radar dual sensing, low false alarm rate; the indicator of detector can be turned off,making it more private. Flexible use and multi-purpose.Receiver can add up to 8 transmitters like detector,magnetic sensor, vibration sensor and doorbell button etc.And can add up to 8 remotes. Professional high quality loudspeaker with up to 113dB loud alarm effectively scare away thieves. 8 chord music chip, loud and melodious ringtone is made over the 40mm big loudspeaker. Three-layer waterproof detectorsoftware anti-interference algorithm reduce false alarms. Suitable for indoor and outdoorsuch as doorwaydrivewaygarage,mailbox... More applications are waiting for you to explore! Note The Sensor and Receiver can be used together. The remote control is purchased on demand. A Sensor, a Receiver, or a Remote Control cannot work separately,And they cannot be paired with other styles of sensors!!! Description 1.11 ringtones for you to choose 4 levels adjustable volume can be up to 113dB.Choose the ringtone you need according to different occasions. 2.IP64 Waterproof IP64 means that the product can prevent the intrusion of solid foreign objects with a diameter greater than 12.5mm and prevent splashing water from intruding. 3.The indicator light of detector can be turned on/off. Open the battery cover and install batteries, long press the hidden setting hole as shown in the figure with ejector pin. If the LED in the hole flashes twice quickly, it means that the sensor indicator is turned on; if the LED in the hole keeps on once, it means the sensor indicator is off. 4.PIR motion sensor People and animals walking in front of the detector will cause an alarm to alert you in advance and protect your safety 5.Easy parking When the vehicle reaches the appropriate position when parking, it will sound an alarm to help you judge the distance 6.Multi-angle detection The angle can be adjusted, the horizontal angle can be adjusted 360, and the vertical angle can be adjusted 180, without missing any dead angle Specifications Color: White Material: ABS Volume: 113 ~ 25dB Power Supply (Receiver): Micro USB or AA alkaline battery x 3 (not included) Power Supply (PIR Transmitter): AA alkaline battery x 2 (not included) Battery lifespan:5-7 months (based on 30 minutes per day) Wireless range: 280m/918ft Motion detecting range: 2 - 8 m/6.6-26ft Ring Volume: 113dB Working frequency: 433.92MHz Certification: CE, CCC, CQC Package content 1 x Infrared Curtain (PIR Motion Sensor) 1 x Alarm Bell (Receiver) 1 x Desktop Base 1 x Suspension Bracket 1 x Double-Sided Adhesive Tape Mounting Screw 1 x User Manual (REFERENCE)