Features 1、HD SOUND QUALITY: The sound decoder board is Bluetooth 5.3 version, providing a premium sound experience, 4Ω 10W to 15W speaker, enjoy pure music. 2、MULTIFUNCTIONAL DESIGN: This Bluetooth sound decoder board has 4 buttons, supports Memory Card and 2 stereo speakers in series, easy to switch the playback mode. 3、CHARGING METHOD: The Bluetooth sound receiver board supports 5V solar charging and TYPE C charging input, no need to worry about the battery running out. 4、SIMPLE OPERATION: One key to turn on the sound receiver module, default Bluetooth connection, automatic shutdown guard, convenient, power saving. 5、COMPATIBLE FORMATS: This sound amplifier board supports a variety of music formats playback, such as MP3, WMA, WAV, RLAC, APE, to meet different needs. Specification Item Type: BT Sound Decoder Board Material: PCB BT Version: BT 5.3 Battery: 1 x 18650 Battery (Not Included) Charging: 5V Solar Charging Or TYPEC Charging Input Charging Reminder: Red Lamp When Charging, Green Lamp When Fully Charged Speaker Power: 4Ω 10W to 15W Package List 1 x BT Sound Decoder Board 1 x Speaker Wire 1 x Solar Panel Wire