jsTickerTHISproblem

function Ticker(tickerId, baseDelay=3000, ticksCount=10)
{
    //let this = {};
    this.tickerId = tickerId;
    this.delay = baseDelay;
    this.ticksCount = ticksCount;
    this.cnt = 0;
    this.id;
    this.arm = function()
    {
        this.cnt = 0;
        this.id = setTimeout(function ticker(){
            console.log(`Ticker #${this.tickerId} ${this.cnt}`);
            (this.cnt++) % 2 ? this.delay *= 2 : this.delay /= 2;
            if (this.cnt == this.ticksCount && this.ticksCount != -1) { clearTimeout(this.id); }
            else { this.id = setTimeout(ticker, this.delay)};
        },this.delay);
    };
    this.disarm = function()
    {
        clearTimeout(this.id);
    };
    this.set = function(baseDelay=3000, ticksCount=10)
    {
        this.delay = baseDelay;
        this.ticksCount = ticksCount;
    };

    this.get = function()
    {
        console.log(`Ticker #${this.tickerId}\nDelay: ${this.delay}\nTicksCount: ${this.ticksCount}`);
    }
    //return this;
};