electronic, mechanical, or other device
(5) “electronic, mechanical, or other device” means any device or apparatus which can be used to intercept a wire, oral, or electronic communication other than— (a) any telephone or telegraph instrument, equipment or facility, or any component thereof, (i) furnished to the subscriber or user by a provider of wire or electronic communication service in the ordinary course of its business and being used by the subscriber or user in the ordinary course of its business or furnished by such subscriber or user for connection to the facilities of such service and used in the ordinary course of its business; or (ii) being used by a provider of wire or electronic communication service in the ordinary course of its business, or by an investigative or law enforcement officer in the ordinary course of his duties; (b) a hearing aid or similar device being used to correct subnormal hearing to not better than normal;