1、LOW POWER CONSUMPTION: This two way intercom doorbell features a standby time of up to six months, ensuring dependable performance with minimal energy consumption. 2、LONG RANGE: With a wireless design that boasts long distance transmission and high signal strength and sensitivity, it can operate up to 100 meters (approx. 328.1 feet), ensuring you never miss a visitor. 3、EASY INSTALLATION AND CONNECTION: Simply stick it onto the wall. One outdoor unit can be connected to multiple indoor receivers without interfering with other devices in your home or nearby. The wireless intercom doorbell is expandable, allowing you to expand virtually any indoor or outdoor system, even up to a set of 2 transmitters and receivers. 4、ADJUSTABLE SPEAKER, MULTIFUNCTIONAL: It features an adjustable speaker, which provides clear and loud sound, and also functions as a portable mobile radio. 5、WIDE APPLICATION: This intercom wireless doorbell is suitable for use in homes, apartments, schools, villas, offices, warehouses, hotels, factories, hospitals, and more. Item Type: Doorbell Material: ABS Weight: Approx. 251g / 8.9oz Battery: Li Battery, 1200mAh (Built in) 2 x Doorbell 1 x USB Cable 2 x Double Sided Tape 1 x Screwdriver 1 x Instruction Manual