Features: brand new and high quality Ultra-thin small,strong ability to penetrate. Widely used in hotel electronic door locks, intelligent teaching equipment of biometric access control management system, monitoring, call system of medical wards, intelligent control of household appliances and lighting, etc. With high-performance spring antenna, the limit distance is up to 1000m. Operating frequency range (433.4-473.0MHz, up to 100 communication channels) with 100mW transmission power (configurable). The communication distance can be adjusted to 1000m, and the baud rate in the air is 5000bps. Specifications: Material:ABS Power supply: 3.2V-5.5V Operating frequency range: 433.4-473MHz Size: Approx.27.8x14.4x4mm/1.1x0.56x0.16inches Package Includes: 1 Set Wireless Module note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.