Support multiple receptions, no upper limit. Automatic frequency hopping technology. Can switch channels. Long effective range. One-touch mute button with red light prompt. Function indicator: with power and channel mode switching indication. Long battery life to meet long-term needs. With charging case. Operating Band: 2.4GHz Band Sampling Rate: 24-bit/48kHz Latency: Less than 14.9ms Effective Range: 30 meters outdoor transmission distance Operating Time: Transmitter battery life 24 hours, Receiver battery life 6 hours Battery Capacity: Transmitter 1800mAh, Receiver 200mAh Channels: True Stereo / Switchable between Mono and Stereo Receiver: Adjustable volume and mute function, Transmitter: One-touch mute feature Multi-device Support: Supports up to 4 devices operating simultaneously Transmitter-to-Multiple Receivers: Supports one transmitter transmitting to multiple receivers -device Spacing: 2-3 meters recommended between units. Status Indicator: When the receiver's battery is below 20%, the red LED flashes intermittently. During charging, if the receiver's battery exceeds 80%, the green LED flashes intermittently; when the battery is above 95%, the LED turns off automatically. Power Supply: Built-in lithium battery, rechargeable via USB Type-C port, recommended to use a 5V 1A charger. Weight: Transmitter 75g, Receiver 15g Colour:Black Material:plastic Package Contents: 1 * Wireless Audio Transmitter 1 * Wireless Audio Receiver 1 * Charger Case 1 * USB Cable 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.