Frequency modulation and demodulation technology based on digital signal processing Frequency range: 400~470MHz SMS sending and receiving function Built-in CTCSS (38 groups), CDCSS (83 groups) codec Automatic tail tone cancellation function and additional features include digital volume adjustment, voice-activated hands-free calling, adjustable squelch level, software-adjustable microphone sensitivity, high receiving sensitivity, ultra-low power sleep mode, compact size, and communication distance of up to 10 kilometers in open areas. This product offers advanced communication capabilities with a frequency range of 400~470MHz, allowing for efficient SMS sending and receiving. It features built-in CTCSS and CDCSS codecs for enhanced privacy and clarity during conversations. The automatic tail tone cancellation function ensures seamless communication, while the digital volume and voice-activated hands-free calling features provide convenience and ease of use. With adjustable squelch levels and microphone sensitivity, users can customize their experience for optimal performance. The device operates on a low power sleep mode, making it energy-efficient, and its compact size allows for portability. Communication distance can reach up to 10 kilometers in open areas, making it suitable for various applications. Color: Black Material: PCB Package Contents: 1*Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.