Multi Channel:Wireless Tour Guide System have 35 channels, 1 click frequency adjustment, using 2.4G international general channels, strong compatibility, 35 frequency bands are free to switch. Widely Applicable:Wireless Tour Guide Voice Audio Transmission System is high speed original sound transmission, satisfying the explanation of tour guides, corporate reception, wireless conference, wireless teaching and large multi person scene . HD display:Wireless Tour Guide Voice Audio Transmission System is HD display, OLED high clarity wide angle display, clearly display channels, signals, power, volume information,etc. Ultra long call distance:Wireless Explainer have super long call distance in the absence of obstacles, the call distance can reach 100-150 meters. Design:Wireless Tour Guide System use digital signals, sound transmission is stable, and the confidentiality is high. Let every communication look like close. Specification: Work temperature: 55C ~ 125C Call distance: 100 ~ 150m barrier -free distance Number of channels: 35 Frequency: 2.4GHz Battery capacity: 1000mAh Charging interface: DC5V 1A (Type-C) Product color: white Material: ABS+Display Size Chart: Transmitter:13cmx5cmx2.5cm/5.12inchx1.97inchx0.98inch Receivers:8.1cmx4.5cmx1.9cm/3.19inchx1.77inchx0.75inch Package Includes: As you choose: 1 Transmitter 1 Microphone 1 Lanyard 1 Type-C Charging Cable 1 Chinese And English Manual or 1 Receiver 1 Headset 1 Lanyard 1 Type-C Charging Cable 1 Chinese And English Manual Note: Please allow slightly errors due to manual measurement and different monitors.