Synergy Wireless Doorbell with Remote Cover - Operating range up to 120m in open area ensures you to hear the bell and answer the door in time. - 36 Different tones with 4 levels of adjustable volume, built in flashing light indicators for easy visibility, especially for people with impaired hearing. - Installs easily, just plug receiver into an electrical outlet (no batteries required for main receiver). The push button can be fixed to the door frame with the attached adhesive tapes. The push button is weatherproof and acceptable for outdoor use. - Includes super durable remote cover for extra protection against rain and sunlight. - Package Contents: 1 plug-in receiver, 1 remote transmitter, 1 remote cover, 2 double sided tape, 1 size A23 battery for remote transmitter. - Model No. SWD-1802C **Kindly remove the plastic seal of the battery before use**