Core Viewpoint - The introduction of a new device in elevators, allowing users to receive cash rewards by tapping their phones, has sparked curiosity and concern among residents regarding privacy and consent for installation [1][2][4]. Group 1: Device Functionality and User Experience - The device, named "分众碰一下," is a collaboration between the media company 分众传媒 and Alipay, enabling users to access a mini-program for cash rewards or coupons by tapping their phones [4][5]. - Users have reported mixed experiences, with some receiving small cash rewards, while others express concerns about the device's potential to leak personal information [7][9]. - The device does not have payment capabilities and does not collect personal privacy information, as stated by the company [4][11]. Group 2: Installation and Community Response - The installation of the device was reportedly done with the consent of the property management, but many residents were unaware of its purpose prior to its installation [2][9]. - Concerns have been raised about whether the installation required broader community consent, as many residents did not receive prior notification [9][11]. - The property management has not yet clarified if there will be any additional fees associated with the device or how any potential revenue will be shared with residents [9][11]. Group 3: Legal and Regulatory Considerations - According to legal experts, any changes to common property usage, such as the installation of this device, require approval from a significant majority of property owners [11]. - The revenue generated from such installations should be shared among all homeowners after deducting reasonable costs, as per existing property management regulations [11].