Part Number:Rosilesiw09r7p2v5s Finish:Finish Material:Material Power Source:PowerSource Installation method:InstallationMethod Item Package Quantity:1 Spout height:1 Centimetres Included Components:Inc Batteries included?:No Batteries Required?:No Item Weight:139 g Delivery information::We cannot deliver certain products outside mainland UK ( Details). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. Package List: 1 * Indoor Bell 1 * Outdoor Bell 2 * Glue 1 * Screw Driver 1 * User Manual Description: This is a portable doorbell system for home, factory, hotel, market, and more. Built-in microphone and speaker allow super sound quality for dual way communication. Simple and small design, easy to use. Specifications:Indoor Machine Voltage Range: 5V USB Direct Power Supply Indoor BellOutdoor BellPower Supply 4 x AAA Batteries (NOT Included.) Input Interface Micro USB Wireless Frequency 467.6375MHz Transmission Distance 300m 5 ~ 50m Working Time > 6 Months 48h Working Temperature -20 ~ 55 Size Approx. 100 * 60 * 16mm / 3.9 * 2.4 * 0.6in Approx. 100 * 60 * 16mm / 3.9 * 2.4 * 0.6in Package Size Approx. 170 * 120 * 25mm / 6.7 * 4.7 * 1.0in Package Weight 150g 2.4GHz signal ensures stable and smooth transmission. The effective transmission distance can be up to 300 meters. Ultra-Long Standby: The Indoor bell is power supplied by rechargeable lithium battery, the outdoor bell can work for more than 6 months with 4 pcs of AAA batteries, power saving. Built-in high sensitivity microphone and speaker, allow audio input and output, ensure clear and smooth sound effect in communication. Dual-Way Intercom: When someone press the call button on outdoor unit, the indoor bell will ring immediately for reminding you. You can press the response button to talk with the people outside. Simple and Elegant: Ultra mini size ensure perfect portability and easy installation, small and nice, easy to install. See more product details 2.4GHz signal ensures stable and smooth transmission. The effective transmission distance can be up to 300 meters. Ultra-Long Standby: The Indoor bell is power supplied by rechargeable lithium battery, the outdoor bell can work for more than 6 months with 4 pcs of AAA batteries, power saving. Built-in high sensitivity microphone and speaker, allow audio input and output, ensure clear and smooth sound effect in communication. Dual-Way Intercom: When someone press the call button on outdoor unit, the indoor bell will ring immediately for reminding you. You can press the response button to talk with the people outside. Simple and Elegant: Ultra mini size ensure perfect portability and easy installation, small and nice, easy to install.