Features: 1. [Clear sound] The 80mm large-diameter composite high-pitched crystal magnetic horn is equipped with carbon atom lattice graphene diaphragm to greatly restore the real human voice 2. [clear no whistling] Equipped with IC/CVC dual technology, through acoustic experts to tune the three-tone ratio combined with the principle of frequency shift, greatly reduce the whistling frequency 3. [lithium-ion battery] durable battery life, according to the teacher's use frequency of 2 classes per day to calculate the normal full charge can be used for about 2 weeks 4. [Voice loop broadcast] Plug in the memory card /U disk to start the loop playback of lesson preparation recording loop playback, use more worry 5. [Multi-scene application] Suitable for teaching/tour guide/promotion/party, et
