Description: updated the design of the receiving station so that it does not block neighboring power sockets. The internal bell hub is plug and play, no batteries required, low power consumption. Outdoor bell button with tamper alarm function. The receiver working together with the doorbell button and window/door sensor,making it a burglar alarm system and your 24h private guard. Put whole-home security at your fingertips with smart life app whether you are at home or at work . Wireless range with 500 ft ,and no monthly fees! Add additional components and accessories at any time. Up to 100 wireless detectors or doorbell buttons can be added. In the future, we will provide more accessories for you to choose from, such as window&door sensors, pir motion detectors, remote controls, doorbell buttons, sos button, etc. Please feel free to follow our official store. Remote phone support / disarm / intercom / monitoring function. Support for 5 groups of predefined phone numbers for alarm, sms on / off and on / off dialing can be configured respectively for each phone number. Support 5 types of wireless defense zones mode, can be set as doorbell mode. You can record 20 seconds of alarm voice. Support remote configuration via sms. features: power supply: 110 / 220v ac backup battery: 3.7v, 300mah lithium battery (included) consumption: <100ma radio frequency: 433mhz wi-fi: ieee802.11b / g / n app: tuya selectable melodies: 58 volume levels: 5 (includes mute) sound level (typical): 85dba expandable: up to 100 bell buttons / sensors and 10 remote tags operating temperature: -10-55 ℃ power supply: battery lithium dc 3v 1 * cr2032 (included) standby current: <5ua transmission distance: 100m / 328ft (without obstacles and without interference) radio frequency: 433mhz item size: 68 * 43 * 17mm / 2.7 * 1.7 * 0.7in operating temperature: -10-55 ℃ package information: package size: 11.6 * 8.3 * 5.3cm / 4.6 * 3.3 * 2.1in package weight: 140g / 4.9oz package includes: 1 x base station 2 x magnetic sensors 1 x doorbell transmitter button 1 x user manual (english)