Dual Comfort Chair Cushion 18 W x 16 D X 4 H Maternity Posture Support Comes with Batteries 85180 Comes with Batteries 5mm sizes * Adapter to allow use with Welch Allyn or compatible disposable specula * Nasal speculum adapter with manual screw opening for instrumentation connects to the otoscope head Ophthalmoscope: * Ophthalmoscope * head with lens wheel featuring 25 corrective lenses from 25 to +40 diopters Bent Arm Illuminator: Chrome plated bent arm larynx and nasopharynx illuminator for lighting the oral cavity and pharyngeal area * One 3 Designed for long term users of wheelchairs * Provides comfort for an entire seat or chair with soft comfortable covoluted foam and ties to secure it * Seat size is 18 W x 16 D X 4 H Back Size is 18 16 x 3 * Helps promote good posture while cushioning the body preventing sores and offering a slip free seat