Description: Features: 1. Appearance: All black, can be placed directly on the desktop or installed on the wall. 2. Comes with an 8W high fidelity speaker, which can be connected to an external speaker through an audio adapter cable. 3. Using button batteries, power outages do not waste time and do not require additional settings. 4. Can be used in conjunction with the 433 pager and startup keyboard for call services and call scenarios. 5. Can be used with 3 pairs of launch keyboards simultaneously. Suitable for multi window call sign and meal pickup scenarios. 6. Partition settings can be made to meet different needs. 7.4 sets of call numbers, 7 different voice call prompts. 8. The controller can be set for convenient wall mounted operation. Specifications: Receiver display host Working frequency 433.92MHz Decoding Method Learning Code Adapter AC 100-240V 50/60Hz, output: DC 9V/1A Sensitivity better than -108dBm Working voltage host paired with 12V/2A matching power supply Size 260 * 180 * 70mm Notes: 1. This product integrates call and number calling functions and can be widely combined and applied. The package includes: 1 x receiving host 1 x power adapter 1 x audio cable 1 x English user manual