say a dsd6 inside the helmet only for receiving alarms from its buzzer
BTW I still have plenty of them, if anyone wants some DS-D6 I can ship them relatively cheap (e.g. two for 15 eur including registered EU shipping, shipping is almost a fixed cost at this weight so more can get cheaper). Got carried away when they were cheap and won't really have a chance to use them all :-) Still new in box. Also have few others (DK08,F07,HX03W). If anyone is interested just PM me. Otherwise sorry for spam.