When activated (punch to activate), this prevents your world from being listed on the World Select screen.
Signal Jammer price in Growtopia: sells for about 4 WL, buyers pay about 1 WL (median of 1264 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: MDAO, 4AA7, ZONYT, PF14, ISCEP