Coming from here and there:   Here's a focusing copycat comparative field test by the rather interesting Tom Antos' review:   Dual Lav mics system advantage over other solutions out there such as these ones, David @IronFilm? In any case heavier than these two, isn't it? https://www.bhphotovideo.com/c/product/1472750-REG/azden_pro_xr_2_4ghz_digital_wireless_microphone.html/specs https://www.bhphotovideo.com/c/product/1072850-REG/senal_aws_2000_a_advan