A. Usage Tips: When you have a vintage car with a tape player, the cassette Bluetooth receiver will let you continue to enjoy the music on your phone. You don't need to replace or refit your car to avoid destroying its classic. B. The Cassette Bluetooth 5.0 receiver is compatible with most smartphones and is ideal for home or car audio systems. This is a box-type Bluetooth receiver for cars or devices that don't have Bluetooth and want to receive Bluetooth signals. Just adjust the audio equalization settings on the player and you'll get the music classics. C. You can answer phone calls or control music on the receiver. Change volume, play/pause/skip music, answer calls. Support any phones, tablets, MP3 players, car stereo, headphones, Hi-Fi, portable speakers, or other devices equipped with standard Bluetooth tech. Seamlessly transmits stereo audio, making you enjoy your music anywhere and anytime. D. Built-in battery provides up to 8 hours play and talk time, 168 hours standby time, only takes 1.5 hours to fully charge it. Premium Chip supply more stable and faster transmission with less power consumption, which can represent a superior audio performance to spoil your ear and never feeling boring while driving. E. Specifications: Color: Black; Bluetooth Version: 5.0; Rechargeable Battery (lithium battery): rechargeable; Battery Capacity: 130mAh. F. Package included: 1 x Cassette Adapter; 1 x USB Charging Cable