Specifications: Bluetooth Version 2.1 No software installation required; easy to use Supports A2DP and AVRCP profiles Compatible with Bluetooth stereo headsets and earphones for play/pause, forward/backward controls Automatic pairing (no button press required) Default PIN codes: 1234, 0000, 8888 Operating frequency range: 2.42–2.480 GHz Automatic standby mode activates when no compatible headset/earphone is detected, conserving power Compatible with iPhone, iPod mini, iPod nano, iPod video, and other devices with 30-pin dock connector Type: Bluetooth transmitter Material: ABS Operating current: 40 mA (max) Effective range: 10 meters Dimensions: 9 cm × 6 cm × 1 cm (approx. 3.54" × 2.36" × 0.39") Note: Color may vary slightly due to lighting and screen settings. Slight dimensional variations may occur due to manual measurement. Package Includes: 1 × Bluetooth transmitter