Bluetooth 5.0 pairing saves energy Stable transmission, no lag Open the cell phone Bluetooth search W510B_1305 device, click on the pairing automatic connection, connecting After successful connection, it will be saved in your cell phone, and you don't need to manually connect again next time (your cell phone will automatically search for the paired Bluetooth device). Strictly controlled sound quality, HiFi standard Cost-effective choice. Stable and reliable performance, not only supports Bluetooth connection, but also supports wired connection to mobile phone/computer. Realize lossless decoding, using for TDA1305T decoding chip, listening to warm and thick solid, female voice bright and delicate, no digital flavor. HD Decoder Computer USB+Mobile phone OTG+Bluetooth Connect amplifier, active audio, high frequency audio headphones. Colour:Silver Material:Aluminum Alloy Package Contents: 1 x Bluetooth Audio Amplifier 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.