What's in the box:

HIFI-class BT 4.0 Audio Receiver Box Amplifier Car Stereo Amplifier Modification Acceptor (1)

Made of fine quality material, practical, easy to install and use, wide application range, has a long service life.

Features:
Aluminum anode gold case, wear-resistant and not easy to rust.
Can be powered by mobile phone recharger, computer, power bank, etc.
BT version 4.2: various versions of BT connection stereo input, using CSR64215 BT chip, BT V4.2, support APTX low delay, extremely high software compatibility.
BT version 4.0: various versions of BT connection stereo input, using CSR8635 BT chip, BT V4.0, extremely high software compatibility.
Audio output: 3.5mm earphone stereo audio output (dedicated amp chip processing can directly drive the earphones or use for amplifier audio input); RCA audio stereo audio output (for amplifier audio input, can not drive the earphones).

Specifications:
Material: PCB+aluminum anode case
Main color: gold+black
BT version: 4.0, 4.2 (optional)
BT chip:
V4.0: CSR8635
V4.2: CSR64215
BT frequency: 2402~2480MHz
Power supply: Micro USB 5V
Effective distance: 3-20m (related to the environment and the sender)
Output method: 3.5mm earphone / RCA lotus output
AptX encoding: V4.2 support
Transmission level: lossless transmission
Compatibility:
V4.2: 4.2 and below 4.2
V4.0: 4.0 and below 4.0
Item size: 55 * 52 * 22mm / 2.2 * 2.0 * 0.9in
Item weight: 55g / 1.9ounce
Package size: 65 * 62 * 32mm / 2.6 * 2.4 * 1.3in
Package weight: 60g / 2.1ounce

Package list:
1 * HIFI-class BT Audio Receiver Amplifier