(Signia Pure 312 CROS X (links To Signia X) Hearing Aid, Silver, Takes Battery size 312. The CROS hearings aids have one vent above the buttons rather than the three vents for the NX model). This is the CROS hearing aid (i.e. the transmitter, it'll need a Signia Pure X range and pairing to receive the signal for audio - not included).
