What is the fine-grained topic of the following text: The SBC220 networked dual-docking charger works with SB900A, PSM 900 (P9RA+ only), PSM 1000 (P10R+ only), QLX-D Digital Wireless Systems, ULX-D Digital Wireless Systems, and Axient Digital (AD1 and AD2 only), available with and without power supply. Only return the topic.
SBC220 Networked Dual-Docking Charger Compatibility