【Multi-Mode Intelligent Alarm】 This door sensor provides 4 smart alarm modes: 1. Delayed alarm（default mode）: If the door is open for 1 minute and not closed, a voice prompt will sound immediately；2. Loud alarm (single-click SET button): After the door is not closed for 4 minutes, a 110dB alarm will be continuously sounded for 1 minute；3. Instant alarm (double-click SET button): When the alarm and the magnetic strip are more than 2cm, the door alarm will sound immediately (no voice prompt)；4. Chime mode ((triple-click SET button): When the alarm and the magnetic strip are more than 2cm, a single "ding-dong" will sound 【4-Level Adjustable Volume】The window alarm has 4 levels of adjustable volume (65/80/95/110dB), which can be freely selected, up to 110dB, to adapt to different work scenarios such as windows, doors and swimming pools. When the pool alarm is triggered, the red light of the alarm flashes to enhance the warning effect. 【Strong Battery Life】 The window safety alarms is powered by 3 AAA batteries (900mAh), which has long battery life and eliminates the trouble of frequent battery replacement. The doorbell also has a low-battery intelligent reminder function. When the voltage is lower than 3.6V, the window safety alarms for home will continue to beep and the light will be on. 【Suitable for Multiple Environments】 The door alarms for kids safety are made of ABS material, which is impact-resistant and wear-resistant, and will not deform after long-term use. Its operating temperature range is -10℃~55℃, which can adapt to extreme environments (such as cold storage and high-temperature warehouses). The door open alarm alarm also has an IP44 waterproof rating, which is splash-proof and dust-proof, and can be used indoors. 【Easy to Install and Use】The door alarms when opened are equipped with a toggle switch, which can be turned on and off with one button, making them easy to operate. The door safety alarm for home use triggers automatically via magnetic induction when its main and auxiliary units are separated by over 20mm (±5mm tolerance). It is easy to install and responds quickly (Note: Keep the installation area clean to ensure normal use). The SET button can quickly switch modes (single/double/triple clicks) without complicated settings. 【36 Months Warranty】If you encounter any problems in using the door sensor alarm, please feel free to contact our professional customer service team, enjoying TECKNET 36 Months Warranty (Registered Only). 【Friendly Reminder】(1) The insulating sheet must be pulled out before use；(2) Please refer to the instruction manual before use to avoid errors；(3) After powering on, the default mode is a delayed alarm；(4) Press the "set" button once to switch to delayed alarm mode；(5) Press the "set" button twice to switch to immediate alarm mode；(6) Press the "set" button three times to switch to doorbell model；(7) Each press of the "set" button will switch modes.；(8) The mode will be reset after powering off and restarting；(9) If there is no response after powering on, please repeatedly press the SET button until a "beep" sound is heard., Manufacturer: TECKNET