HUMMER max stimulation vibrating sleeve increases your overall experience when using the HUMMER or HUMMER 2.0. The uniquely designed, vibrating sleeve, with an inner hair like texture and 6.5 inches deep, can be used with or without the HUMMER BJ machine. Call it a little something extra from Hummer to you. Includes a detachable vibrating stroker • Powerful Vibration. • Integrated Pleasure Ring. • Rechargeable USB Cable Included.