CrySensor: Integrated technology hears their cries and automatically soothes them back to sleep Soothing sounds and adjustable volume: Three natural sounds – white noise, rainfall, and heartbeat – and three classic lullabies to choose from USB rechargeable: One full charge lasts up to 25 hours Travel-friendly: Fabric loop attaches to the handle of your pram, bag or anywhere else that’s safe Machine washable: Ollie's soft plush fabric is machine washable