Features:1. With 2.4G wireless technology, Wireless Teaching Headset can transmit up to 50m in an open area and can give you a stable signal and strong anti-interference.2. High-sensitivity sound pickup can keep you from howling and maintain a clear and loud sound.3. Easy for you to use, you just open the receiver and transmitter, then they are connected automatically.4. Rechargeable design for you to free the trouble of replacing the battery, and it charges for 2-3 hours, serving for 6-8 hours.5. Widely used to connect with voice amplifier, high power speaker, portable PA system, and mixer.Specifications:Product Name: Wireless Teaching Headset Frequency Range: 100-15KHzColour: BlackTransmitter Power: over about 10DBMReceiver Sensitivity: lower about 99DBN@80DM SNRTotal Harmonic Distortion: less than about 0.3%Digital Sampling: 16bit-16KhzAudio Dynamic Range: over about 100DBAntenna: Maximum Distance 50mBattery Life: 6-8hBuilt-in Battery: 120mahAdapters: 3.5mm Interface Suitable for Loudspeakers / 6.35mm Interface Suitable for SpeakersPacking List:2.4G Wireless Teaching Headset *1 3.5mm Interface*1 Type-C One-To-Two Charging Cable*1 Manual*1 or 2.4G Wireless Teaching Headset *1 6.35mm Interface*1 Type-C One-To-Two Charging Cable*1 Manual*1 Notes: 1. Due to the lighting effects and shooting angles, there is a color difference in the product, please understand.2. Due to manual measurement, there is a tolerance in the product size.