Comes with all parts, rechargeable battery and water resistant shell. Worked in less than two months to get my little one to stop wetting the bed at night. Hasn’t had an accident since! Useful Features: Volume control- DryEasy provides 6-level volume control which caters to different needs. Selectable sounds- DryEasy provides 6 selectable sounds to suit users' preference and avoid users from getting used to a particular sound. Random playing- Some users may not respond to the alarm due to inertia. Our random playing feature helps to avoid this phenomenon. Different operation modes- Operation modes include sound plus vibration, sound only and vibration only. Detachable cable- Replacement cable can be bought separately without having to buy a whole new unit. Rechargeable battery- Build-in rechargeable battery which is convenient and cost-saving. Different ways of wearing: The alarm can be attached to the pajamas top or to the arm.