Railtones subwoofer provides additional bass support. Plugs into the wall and connects wirelessly to the railtones transmitter. Includes 4" driver. Railtones remote will also control volume on the subwoofer.
Motorola SNN5725 battery, Standard capacity Lithium-Ion battery is the factory original battery designed and built specifically for the Motorola ROKR/ C331t/ C332t/ C333/ C343c/ C343t/ C353/ C353t/ E1/ E310/ iTunes/ T720/ T720c/ T720g/ T720i/ T720ti/ T721/ T722i/ T730c/ T731/ V810 cell phone models.