This wireless voice doorbell talk with visitor via two-way voice intercom,know who visit your home, speak to them and let them know I'm coming, please wait. Low power consumption, long standby time for outdoor-bell up to six months. Exquisite, small, beautiful, and high grade. Why not have a look? Features: Wireless voice doorbell, talk with visitor via two-way voice intercom,know who visit your home, speak to them and let them know I'm coming, please wait. Comply with rulers and regulations related to FCC, CE, CCC. Outdoor-bell is power supplied by 4pcs alkaline battery, easy to replace the battery, indoor-bell is power supplied by rechargeable Li-ion battery. Low power consumption, long standby time for outdoor-bell up to six months. Big and adjustable speaker, clear voice, can be used as mobile interphone. Long wireless distance up to 300m/328.1yd -Strong and stable signal transmission in big house, cover range up to 300m/328.1yd（without any obstacle, any block). It is super convenient to answer the doorbell of the visitor at any distance in your room. Easy installation - The doorbell can be fixed on the wall with the use of adhesive stickers(not included). Outdoor-bell pair with indoor-bell by learning its code, 1 outdoor-bell can paired with N indoor-bells and no interference each other. Exquisite, small, beautiful, and high grade. Specification: Item Type: Wireless Intercom Doorbell Material: Plastic Color(Optional): Silver, Gold Package Weight: 185g/6.5oz Outdoor Unit Working voltage: 4*alkaline battery (1.5V*4) Working temperature: -20-55 ℃ Transmission distance: 300 meters in space, obstacles 50-100 meters Working frequency 467.6375MHZ Working time: more than six months IP level: N/A Indoor unit Working voltage: rechargeable Li-ion battery Working temperature: -20-55 ℃ Transmission distance: 300M（w/o any obstacle） 50-100M（w/ obstacle) Wireless Frequency: 467.6375MHZ IP level: N/A Package List: 1 * Indoor walkie-talkie 1 * Outdoor walkie talkie 1 * USB interface cable 1 * Screwdriver 1 * Manual .