1. Bluetooth 5.3, support multiple protocols, compact and long battery life, Lavalier design, exquisite and compact2. Support a variety of Bluetooth protocol (A2DP/AVDTP/AVRCP/RFCOMM/HFP/HSP SPP/HID)3. Transmission distance of 10meters, get rid of the length limitation of wired headset.4. TF card slot, the second to change the Walkman (music format support MP3/WAV)5. Built-in high-definition noise-canceling microphone, support for incoming callsProductname: Lavalier Bluetooth 5.3 Audio Transmitter ReceiverBattery capacity:400mAHInterface specifications: Type-C, 3.5mmBluetooth:V5.3Support agreement:A2DP/AVDTP/AVRCP/RFCOMM/HFP/HSP/SPP/HIDTransfer distance: Accessibility 10 mCharging time: 2HPlaying time: About 30HColour:BlackMaterial:ABSPackage Contents:1x BT5.3 Audio Transmitter/Receiver1x 3.5MM audio cable1x Type-C Charging power cableOnly 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.