it's a perfect fit for the helmet, excellent 200m throw as advertised

now my set is complete

P7 front
P7 rear (red)
TK11 R2 on my helmet

all uses the same battery type, now i can swap around the batteries without having to worry about carrying different types

pictures later, it's day time outside even until around 10pm ... LOL it's hard to get a good night shot to show the TK11 R2 in action