Jensen JSB-550


 * "Linkplay A31 V04" is silkscreened on the CPU module in the FCC photos.
 * "CDTECH BTA6622-03" is silkscreened on the Bluetooth module.
 * "C02 V02 Linkplay" is silkscreened on the Voice control module.

FCC external photos and test report documents suggest additional branding:
 * BUSH B100ALF - BUSH Speaker with Amazon Alexa
 * iStation23AC - Amazon Echo Multi-room Hi-Fi Speaker System


 * Linkplay Wireless Speaker Modules
 * Linkplay A28 - Wi-Fi Speaker Module (MediaTek MT7628A)
 * 802.11bgn 2T2R (300Mbps), Analog audio output


 * Linkplay A31 - Wi-Fi Speaker Module (MediaTek MT7688A)
 * 802.11bgn 1T1R (150Mbps), Digital audio input/output