This is a new in the box JJC JM-II Wireless Radio Remote Control with 2.5mm single pin camera connection.  Works up to 30m / 100' away.  16 channels.  Comes with batteries.  Will work with the following, and possibly more-

Canon EOS: R6 II, R6, R, Ra, RP, R8, R10, R100, M6 II, M6, M5, 90D, 80D, 70D, 60D, 77D (9000D), T7i (800D), T7 (2000D), T6s (760D), T6i (750D), T6 (1300D), T5i (700D), T5 (1200D), T4i (650D), T3i (600D), T3 (1100D), T2i (550D), T1i (500D), XSi (450D), XTi (400D), XT (350D), XS (1000D), Digital Rebel (300D), SL3 (250D), SL2 (200D), SL1 (100D), and Elan series
PowerShot: G1 X Mark III, G1 X Mark II, G1 X, G16, G15, G12, G11, G10, SX70 HS, SX50HS
Contax: N and 645
FUJIFILM: X-PRO3, X-T4, X-T3, X-T1, X-T30 II, X-T30, X-E2, X-E1, X100T, X30
Hasselblad: H series
Olympus: OM-D E-M1X, OM-1, OM-D E-M1 Mark III, OM-D E-M1 Mark II, E-M5 II
OM System: OM-1, OM-5
Pentax: K10D, K20D, K100D, K110D, K200D, K-3, K-5, K-5 II, K-7, K30, K-50, K-500, *istDS, DS2, DS, DL2, DL, and D
Samsung: NX10 & NX100; GX-1S, GX-1L, GX-10 & GX-20
Sigma: SD1, SD9, SD10, SD14 & SD15