The wireless audio guide - transmitter mainly transmits voice content through the device. On the same channel as the receiver, it enables one person to explain and multiple people to listen. The 2.4G frequency band used has strong anti-interference ability, high confidentiality and multiple channels. The basic information such as the number of channels and signals is displayed through the O, L, E and D screens. The combination of buttons and knobs makes the product easy to operate and elegant. 1. Supports one-click pairing, saving the time of pairing multiple transmitters one by one; 2. One-way one-to-many explanation; 3. 2.4G common frequency band; 4. Long transmission distance, with an unobstructed distance of 100 to 150 meters. OLED high-definition wide-angle display Product Model: YWI22-T Transmitter Operating temperature: 55℃ to 125℃ Communication distance: 100 to 150 meters, barrier-free distance Number of channels: 35 Frequency: 2.4GHz Battery capacity: 1000mAh Receiver: 1. 2.4G common frequency band 2. Long transmission distance, with an unobstructed distance of 100 to 150 meters. 3. OLED high-definition wide-angle display. Operating temperature: 55℃ to 125℃ Communication distance: 100 to 150 meters, barrier-free distance Number of channels: 35 Frequency: 2.4GHz Color: White Material: ABS Package Contents: 1 Set * YWI22-T Transmitter Kit 1 Set * YWI22-T Receiver Kit 1 * English instruction manual 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.