Siemens Signia Prompt SP BTE Hearing AidPrompt SP is a Super BTE type digital hearing aid. Manufactured by Siemens brand Signia. Suitable for Moderate to Severe flat, sloping and reverse sloping hearing loss. Fitting Range upto 120dBHL. Maximum Gain upto 80dB. Output upto 139dBSPL. Battery Size 675. Power Consumption 1.0mA. Total 8 Channels and 4 compression controls. 4 separate hearing Programs. Standard Pushbutton. Battery door ON/Off function. Volume control, Telecoil, Life Tubes etc. Optiona..