Feature: mini & light & portable design.Easy to use by connecting directly 30 pin dock to change the common sound-box to Bluetooth sound-box. Long distance to play your favourite songs in your device through a Bluetooth connection. Support digital products using Bluethooth, such as , touch, , Bluetooch cell phone, Bluetooth PC, PSP.Complies with Bluetooth 2.0, Plug and Play. Support A2DP V1.2, compatible with all devices enabled with A2DP stereo Bluetooth. Specification: Transmission distance: up to 10 meters (33 feet). Support file: Bluetooth V.2.0 A2DP V.1.2 Connector: Equipment with 30-Pin Dock Transmission distance: Up to 33 feet (10meters) Colour:White Material:ABS Size:4.3*3.5*0.8cm Package Contents: 1 x Audio Receiver note:The sound effect is related to Transmitting Equipment and the Audio Equipment. We have tested with , , , the sound effect is rather with . If you are using the , the sound effect may not satisfied you, because the grade of your phone or mp3, which is the transmitting part, will effect the final sound effect. The Audio Equipment you connected to will also effects the final sound effect. We have tested a 2.1 Stereo System with Bass, the Bass Effect is strong and perfect, The transmission distance is decided by the Transmitting Equipment. We have tested the same with an and a . When using an , the transmission distance can reach more than 10 meters; When using the , the signal strength is weak about 8 meters. It proves that the grade of your phone or mp3;decides the signal receiving and transmission distance. This item is Not Compatible with Universal Dock. This item is Not Compatible with Car Stereo System Only the above package content, other products are not included. Note: Light 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. SZRH A-B