Product Description: Introducing the Bistee Door Chime Wireless Doorbell a versatile and reliable alert system designed to enhance the security and convenience of your home business or office. Our doorbell provides a wide range of melodies and adjustable volume levels to suit your needs. Featuring an easy-to-install design an expandable system and exceptional customer service this door chime is more than just a doorbell - it s peace of mind delivered. Features: 58 MELODIES & 5 VOLUME LEVELS: With our wireless doorbell you can choose from 58 different chimes and adjust the volume from 0 dB to 110 dB ensuring a comfortable and customizable user experience. It even remembers your last melody and volume level after a power outage so there s no need to reset to your previous settings. 150 M/600 FT OPEN AREA RANGE: Our doorbell chime can easily cross through doors or walls ensuring you never miss a visitor even if you are a few rooms away or on another floor. Note: The battery level will affect the signal receiving range so we recommend changing it once every 12 months. EXPANSION SYSTEM: The door/window sensor chime detects every entry and sends an alarm warning to the doorbell chime receiver providing enhanced security. Whether someone is opening your door/window or your pet is coming home you will hear the doorbell chime to remind you. EASY INSTALLATION: Simply plug the door chime into a socket and attach the sensor to the door using the tape provided. Each wireless door chime is pre-paired before shipment. If you need to replace music or add a transmitter please re-pair by holding the receiver s music button for 3-5 seconds. LIFETIME CUSTOMER SERVICE: As a brand committed to excellence we provide our customers with a 30-day money-back guarantee and a dedicated after-sales service team. We re proud to say our product is FCC CE and RoHS approved. Specifications: Model: 1 Receiver & 2 Sensor Operating Range: 600 feet Applicable Locations: Windows doors cabinets garage doors LED Indicator Receiver: Yes 5 Volume Levels (Including Mute Mode): Yes 58 Melodies Chimes: Yes Package Included: 1 x Wireless Doorbell Receiver 2 x Door Sensor 1 x User Manual 1 x Adhesive Tape 1 x 12V 23A Battery for Door Sensor Package Dimensions: 3.78 x 3.62 x 3.11 inches Experience the perfect blend of security and convenience with the Bistee Door Chime Wireless Doorbell. Get yours today!