mongoose $and error

var temp = '{$and:[{"category.path": /,Mobiles & Accessories,Mobiles,/},{$or: [{"specification.general.brand": "Micromax"},{"specification.general.brand":"Nokia"}]}]}';
        Products.find(temp, function(err, productData) {
            if (err) {
                return res.send({info: "Opps sorry"});
            }
            else {
                //console.log(productData);
                for (i in productData) {
                    console.log(productData[i].name);
                }
                res.json({deals: productData});
            }
        });