Features: Easy to install. Host double-sided installation, no wirings required. Remote control makes it easier for you to arm, disarm, and operate the buttons of emergency and doorbell. Compact and innovative design, whether you are at home or abroad, will bring you a full range of protection, so that you can enjoy life at ease. Over a year of ultra-long battery life low-power indication, avoid the trouble of changing batteries frequently, give you a long sense of security. Door and window safety alarm, when the door/window is opened without lifting the alarm, emits a loud alarm sound with 105dB to effectively deter intruders. Designed for rental apartments, commercial suites or single apartments. Specifications: Material: ABS Volume: 105dB Host power supply: 2 AAA batteries (Excluded) Remote control power supply: 1 12V/27A alkaline battery (Included) Receiver size: 8.5*4.3*1.5cm/3.3*1.7*0.6in Package Weight: 72g/2.5oz Package List: 1 * Alarm 1 * Remote Control 1 * Gate Magnet 1 * Instructions Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .