Description: This Bluetooth receiver can convert non-Bluetooth for docking station into a Bluetooth-enabled dock, just by connecting this product to a sound box equipped with a 30pin male connector dock. Features: Easy to use, just by connecting directly 30 pin dock to convert the common sound-box into Bluetooth sound-box. Transmission distance up to 10m. Wireless Bluetooth connection reduces cable clutter around the dock. Play your favorite songs in your device through a wireless Bluetooth connection. Support Bluetooth-enabled digital products, such as for Tablet, Bluetooth cell phone, Bluetooth PC. Complies with Bluetooth 2.0. Plug and Play. Support A2DP V1.2, compatible with all devices enabled with A2DP stereo Bluetooth. Specifications: Output: Bluetooth Support file: Bluetooth V.2.0 A2DP V.1.2 Connector: 30pin Transmission distance: Up to 33 feet (10meters) away Color: White, Black (Optional) Package weight: 15g Size: 46 x 37 x 9mm / 1.81 x 1.46 x 0.35inch Note: 1. Please check your Sounddock before order Just plug your for 4/4S to your speaker dock, if your speaker can play music or your 4/4s phone can charge, that means this Bluetooth receiver is the right adapter for your speaker. 2. Please note that the base of this product will be sent randomly, and make sure you will not mind before ordering. 3. 30pin plug is divided into positive and negative, inserted into the speaker, please make sure that the positive and negative, in order to prevent the insertion of the reverse leads to the interface can not be properly fixed in place so that the device is not normal power supply indicator does not light. 4. Need to switch the speaker's audio input source to the corresponding interface input (if not switched to the corresponding audio input will lead to the music can not be transmitted playback) Package included: 1 x Bluetooth Music Receiver (The dock is not included) .