Features: - User Interface Control buttons: PLAY, STOP, F.F, REW, DIR. Auto-reverse switch, Volume Control - LED indicator: Quick Flash for Search Bluetooth Receiver - Slow Flash for Pair Successful - Transmit Music to Other Bluetooth Receivers - Recommend to Use USB Cable for Power Supply for Better Sound Effect - Includes Auto Reverse Function to turn the Tape Over Quickly with "DIR" Button - Provides Portability and Convenience - Portable Design - Fits in any Bag and can Use it Anywhere - Small and Compact Cassette Player - Bluetooth Function: Transmit Music to other BT Receivers, Press "PLAY" Button and the Device will Auto Search & Pair BT Receiver What's in the Box: - Bluetooth Cassette Player - USB Power Cable - Earphone Technical Specs: - Bluetooth Version: 4.2 - Effective Distance: 10m - Supporting Agreement: A2DP, AVRCP, AVCTP, AVDTP, HFP, SPP, SMP, ATT, GAP, GATT, RFCOMM, SDP, I2CAP - Signal-Noise Ratio: >90db - Frequency Range: 2.402GHz - 2.480GHz - Audio Channel: Stereo L/R - Audio Input: Cassette tape - Audio Output: 3.5mm Earphone Jack, Bluetooth Transmitter - Power Supply: 2*AA Battery, or USB Port Power Supply (5V DC Adapter) - Bit Rate: 128Kbps - Product Dimensions (L x W x H): 4.45'' x 3.35'' x 1.19'' -inches