Interface Bluetooth Receiver Bluetooth 5.3 High-definition Sound Quality Ultra Long Standby Hands-free Call AUX Features: 【 Multi scenario availability】This Bluetooth receiver or adopts a detachable design, which solves the problem of devices without Bluetooth function such as car mounted, headphones, and old audio systems, achieving Bluetooth ion function. 【One click hands-free】This Bluetooth receiver is ed to the car's AUX interface, and the phone can be ed to Bluetooth to make calls or listen to music. 【Wired earphones to Bluetooth】This Bluetooth receiver can be inserted into earphones with AUX interface, which can be turned into Bluetooth earphones. It weighs 10g and can be inserted without any load. 【Bluetooth 5.3 chip】This Bluetooth receiver adopts a newly upgraded Bluetooth 5.3 chip, CSR audio chip, and Bluetooth 5.3 protocol, which enhances audio resolution, reduces delay speed, and ensures more stable signal transmission. 【Metal Plug】 This Bluetooth receiver adopts a metal or processing, which is not afraid of oxidation and conducts more smoothly. It has a small volume, adopts a curved design, and is closely ed to the body of the car. It can be inserted into cars, not limited to devices, and can be used with 3.5mm audio output/input. Product Description: Product Name: Bluetooth Receiver Product color: Silvers Bluetooth version: V5.3 Battery capacity: Built in 120mAH lithium battery Working hours:6-7H AUX out Type-C input Charging time:25minutes Handsfree calling with built-in MIC Product size: 1.22x1.81in Package size:12.2×9.2×2cm/4.8×3.6×0.79in Package weight:40g/0.09lb Product List: 1 x Bluetooth receiver 1 × metal adapter 1 x instruction manual