The transmission range is up to 350m and sensing distance: infrared 28m, radar 68m, (affected by ambient temperature) to effectively keep you alerted. IP64 Rated three-layer waterproof detector, software anti-interference algorithm reduce false alarms. suitable for indoor and outdoor, such as doorway, driveway, garage, mailbox, swimming pools, gates... Dual monitoring detection, infrared and radar dual sensing, low false alarm rate. Research shows, the combined feature of infrared sensor and microwave radar can dramatically reduce the false alarm rate of detector when outdoor use. the indicator of detector can be turned off, making it more private. It can detect movement in the surrounding areas and trigger alert to the paired receiver. Professional high quality loudspeaker with up to 113dB loud alarm effectively scare away thieves. 11 ringtones for your choice. 8 chimes/siren alarm/birdsong loud and melodious ringtone is made over the 40mm big loudspeaker. 4 levels adjustable volume. Mute and flash light has 4 levels brightness adjustable, great for people with hearing disabilities or there is sleeping baby in your house. DIY Pairing: You can choose the quantity of transmitter and receiver as you need. Each receiver can maximum learning 32 infrared, vibration, magnetic etc wireless sensor accessories and 8 remote controllers. Easy to Instal: the receiver is self-adhesive installation, the transmitter is wall mounted and portable. Use batteries or micro USB power supply. Before using, please read the manual carefully and put in batteries (not included), adjust the sensor's angle to avoid false alarming.