1、120dB super loud alarm ringing frightens thieves away, more secure in use. 2、Easy operation, simple one-button switch control doorbell/alarm, double mode can be selected. 3、With this alarm installed in your house, office, factory, when the doors and windows are opened by children or the theft, it will alarm you to check for safety. 4、To stay at the hotel, you can install this alarm on the door and window, it will protect you, upon checking out, take the alarm with you for next-time use. 5、Requires no special wire. Just hang on the inside door knob, open the switch, the piercing alarm will scare off any unwanted intruders, leaving you and your home well protected. Features: 120dB super loud alarm ringing frightens thieves away, more secure in use. Easy operation, simple one-button switch control doorbell/alarm, double mode can be selected. With this alarm installed in your house, office, factory, when the doors and windows are opened by children or the theft, it will alarm you to check for safety. To stay at the hotel, you can install this alarm on the door and window, it will protect you, upon checking out, take the alarm with you for next-time use. Requires no special wire. Just hang on the inside door knob, open the switch, the piercing alarm will scare off any unwanted intruders, leaving you and your home well protected. Specification: Condition: Brand New Material: ABS plastic Color: White Power Supply: 3 * AAA battery (excluded) Alarm Sound: 120dB Alarm Mode: Induction + Touch Installation Method: Hang on the door lock, window Package Weight: Approx.61g Instructions: 1. Ensure that the applicable environment is stable, no factors causing shaking and vibration of products in the room. 2. Install 3*AAA batteries and dial them to the required alarm sensitivity (H/L/0). General selection of L level. 3. Hang the product on the door/window handle and open the switch statically to start working. 4. The alarm sounds 120 decibels when someone wants to unlawfully open the door/window. Package list: 1 * Alarm