Built-in ARM926EJ-S core, 4 KB cache and 4 KB Dcache Supports stereo codec Supports HFP, A2DP, AVRCP, and SPP profiles Noise reduction and echo compensation Multi-path equalizer adjustment; Supports packet loss concealment; Multi-path HFP and A2DP Supports voice messages Built-in lithium battery charger supports 200mA charging and overcharge protection Supports audio equipment with audio input to achieve audio reception and transmission Supports automatic search and connection of Bluetooth devices for audio transmission Built-in noise reduction and ANC noise cancellation circuit for stereo sound and cleaner audio quality Built-in improved signal transmission circuit for longer and more stable connection Compatible with lossless audio formats Supports AUX OUT, headphones Automatic memory connection function for simpler operation and more convenient connection Built-in battery with long battery life Bluetooth 3.0 with low power consumption Live voice messages for simple and clear operation Compatible with Smart, Android, mobile, and PAD iOS systems and all Bluetooth devices Supports connecting to one mobile device Product connection is simple with no complicated download. Color: Black Material: ABS Size: 98 x 59 x 12mm Packaging content: 1 * Bluetooth transmitter 1 * one-to-one audio cable 1 * 3.5mm audio cable 1 * USB power cable Only the above packaging content included; other products are not included. Note: Lighting photography and different screens may cause the color of the object in the picture to differ slightly from the real one. The allowed measurement error is +/- 1-3 cm.