[UPGRADE BLUETOOTH for YOUR for Sounddock]:Add bluetooth for your for Sounddock II, SoundDock 10 Digital Music System, for Sounddock Lifestyle V35 Home Theather System, for Sounddock Lifestyle 135 Home Entertainment System. NOT compatible with for SoundDock Digital Music System. Plug, Pair, and Play, no more actions, rescue your old , enjoy music wirelessly. Support any version of iOS and Andriod devices. [Plug and Play]No battery in the product, power supply by the 30 pin dock speaker, Simple operation; Plug and play. Point [Bluetooth 5.0 Technology]Support A2DP V1.2, compatible with all A2DP stereo Bluetooth transmitter adapter (including mobilephones of any bluetooth version or any , of Android or IOS system), no any other messy lines everywhere. [Easy to Use]Portable and mini size, and handy. Freely and wireless enjoy music;Working distance is no less than 10 meters (30 feet) [Attention:]Not for Car Use! Please check compatiable/incompatiable list before you buy. : Bluetooth Version: Bluetooth 5.0 + , Class II Battery: No Battery, No need to Charge, Plug to Use Bluetooth Profile: A2DP v1.3 Music In Codec Format: AAC, MP3, Bluetooth Range: 10 meters Port: 30 Spille Femminile Docking Audio Port Bluetooth frequency 2 2.402-2.480 GHz Product size: 46.0 x 37.7 x 8.9 mm How to use? 1. Connect the Bluetooth receiver in the 30 pin speaker dock in the right direction, if there is power on automatically, please insert the plug in another direction. 2. Activate the Bluetooth function of your first mobile phone 3. Search BT-4877 and connect to it. 4. If successfully paired, you can play your favorite music wirelessly. Note: This bluetooth 30 pin adapter is NOT for Car use, forthe different circuit design 30 docking pins. Material: plastic colour: black Package Contents: 1 x Bluetooth Receiver 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.