Stay in reliable contact even in noisy or remote environments with the YI-669 UHF Bluetooth Walkie Talk Neckset. Operating on the 400-470 MHz UHF band and offering up to 99 channels this headset gives you long-range communication (800-1000 m) without depending solely on cell networks. It supports Bluetooth SD card/MP3 playback and includes a mini LCD display so you can monitor channel battery and mode directly. Perfect for security events group coordination or outdoor activities. Built for durability and comfort the YI-669 features a foldable bendable design and an integrated antenna that stays out of the way. Its 3000 mAh battery offers extended usage while USB charging keeps things simple. Add in lightweight construction (~350g) SD card media playback and MP3 support for entertainment or listening on the go this neckset blends utility with leisure. 3. Key Specifications Frequency range: 400-470 MHz UHF 99 channels Communication range approx. 800-1000 meters Battery capacity: 3000 mAh rechargeable via USB Audio/output power: ~ 0.5W Features include Bluetooth audio SD card/MP3 playback mini LCD display Lightweight foldable neckset design with integrated antenna; dimensions ~ 380×30×20.30 mm weight ~ 350 g